*Disclaimer: I am not taking the credits for finding and/or fixing all of the things listed below, I am merely compiling a list of fixes in one place. Thanks to the people who found and/or fixed these, it certainly made my game better*
Ok, here are the fixes. Please remember to back up your files before attempting any changes. If you don’t happen to agree with some of these changes, I guess nobody is forcing you to make them. 
Though these are IMO things that are not working as intended, but in any case we can save the discussion for the Colosseum.
\Data\export_descr_building.txt file
1) Seleucids are able to recruit armoured elephants everywhere, and this fix limits them to recruiting only in provinces that have elephants as a resource present, just like any other elephant unit.
Under the entry for circus_maximus find the following line:
Code:
recruit "greek elephant cataphract" 0 requires factions { seleucid, }
change that to
Code:
recruit "greek elephant cataphract" 0 requires factions { seleucid, } and resource elephants
2) Praetorian cohorts are not limited to being recruited only after Marian reforms. This fix limits their recruitment to post-reform period.
Under the entry for imperial_palace find the following line:
Code:
recruit "roman praetorian cohort i" 0 requires factions { roman, }
change that to
Code:
recruit "roman praetorian cohort i" 0 requires factions { roman, } and marian_reforms
3) Thracian phalanx pikemen would be recruitable at the third tier barracks, but as you upgrade the barracks (or as the AI upgrades them for that matter), you are unable to recruit them any more. This fix enables the recruitment of phalanx pikemen for Thrace in all higher-level barracks.
Under the entries for army_barracks and royal_barracks find the following line:
Code:
recruit "greek pikemen" 0 requires factions { seleucid, macedon, }
change to
Code:
recruit "greek pikemen" 0 requires factions { thrace, seleucid, macedon, }
4) Cavalry auxilia are not limited to being recruited only after Marian reforms. This fix limits their recruitment to post-reform period.
Under the entries for cavalry_barracks, hippodrome and circus_maximus find the following line:
Code:
recruit "roman cavalry auxillia" 0 requires factions { roman, }
change to
Code:
recruit "roman cavalry auxillia" 0 requires factions { roman, } and marian_reforms
5) Gauls are able to recruit +1 experience naked fanatics in 1st level farming shrines (not temples, just first level shrines). Gauls do not have the ability to build farming temples at all, and it's only linked to shrines (not upgraded temples), so this fix eliminates that quirk.
Under the entry for temple_of_farming_shrine find the following line:
Code:
recruit "barb naked fanatics gauls" 1 requires factions { gauls, }
and delete it.
6) Spain has the ability to get Longshield cavarly in custom battles. They do not, however, possess the same ability in the campaign. This fix enables them to recruit Longshield cavarly in the campaign as well.
Under the entries for cavalry_barracks, hippodrome and circus_maximus find the following line:
Code:
recruit "carthaginian medium cavalry" 0 requires factions { ct_carthage, }
change to
Code:
recruit "carthaginian medium cavalry" 0 requires factions { ct_carthage, spain, }
7) Spain has the ability to get onagers in custom battles. They do not, however, possess the same ability in the campaign. This fix enables them to recruit onagers in the campaign as well.
Under the entries for archery_range, catapult_range and siege_engineer after the following line:
Code:
recruit "carthaginian peltast" 0 requires factions { spain, }
add this line
Code:
recruit "carthaginian onager" 0 requires factions { spain, }
\Data\export_descr_unit.txt file
8) Since 1.2, horse archers and related units are not able to fire on the move any more. This fix enables them to do so again, with a side-effect of changing the "ranged attack" cursor to spear-like one instead of the bow-like one. The fix for the elephant archers is still not known.
For the following unit types:
barb chariot light briton
barb horse archers scythian
barb horse archers slave
barb noble horse archers scythian
barb scythian noblewomen scythian
east persian cavalry
east cataphract archer
east horse archer
east chariot archer
egyptian bedouin
egyptian chariot archer
egyptian general's bodyguard early
rebel amazon chariots
merc horse archers
merc bedouin archers
find the line
change to
Code:
stat_pri_attr thrown
9) Since 1.2, generals upgrade their bodyguards after Marian reforms. However, this ability is missing for the special upgraded generals of Scythia and Pontus. This fix corrects that.
For the following unit types:
barb scythian general scythian
east pontic general
find the line
Code:
attributes sea_faring, general_unit, hide_forest, hardy
change to
Code:
attributes sea_faring, general_unit, hide_forest, hardy, general_unit_upgrade
\Data\descr_model_battle.txt file
10) Spanish family members appear on the battlefield wearing blue - a stark contrast to the brownish color of the rest of the army. This fix enables them to wear their faction's colors.
Find the following line:
Code:
;texture spain, data/models_unit/textures/officer_celt_general_spain.tga
change to
Code:
texture spain, data/models_unit/textures/officer_barb_general_spain.tga
\Data\world\maps\campaign\imperial_campaign\descr_mercenaries.txt file
11) Due to the typo, one mercenary pool was missing the mercenary horse archers that were supposed to be there. The fix here corrects this by replacing the " ' " symbol with "1" in the entry where the maximum number of merc units is specified. Note: however, it could have been that the maximum umber of units was intended to be 2, we don't know.
Under the entry for pool Armenia find the following line:
Code:
unit merc horse archers, exp 0 cost 800 replenish 0.1 - 0.18 max ' initial 0
change to
Code:
unit merc horse archers, exp 0 cost 800 replenish 0.1 - 0.18 max 1 initial 0
Have fun! 
edit: Added short descriptions of bugs and fixes.
Cheers,
Re: Research: Fixes for bugs in the unit file
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