Was rooting around in the exe for somethings and found the unit abilitys:
wagon_fort
legionary_name
general_unit_upgrade
stakes
warcry
screeching_women
druid
cantabrian_circle
is_peasant
no_custom
start_not_skirmishing
fire_by_rank
gunpowder_artillery_unit
free_upkeep_unit
mercenary_unit
frighten_mounted
frighten_foot
power_charge
very_hardy
hardy
heavy
sea_faring
can_horde
can_swim
can_run_amok
can_feign_rout
can_formed_charge
can_withdraw
Havent tested any of them.