Yes, it is possible to reduce the kill speed of battles. I've used various methods, mostly all revolving around the editing of the export_descr_unit.txt file found in your Rtw\data folder. You can edit each unit, changing their morale rating (stat_mental), playing around with their defense and attack skills and armour ratings, but the easiest method is to just reduce the lethality of their attack.
Eg:...
Code:
stat_pri 13, 3, pilum, 35, 2, thrown, blade, piercing, spear, 25 ,1
stat_pri_attr prec, thrown ap
stat_sec 9, 3, no, 0, 0, melee, simple, piercing, sword, 25 ,1
This is the attack for a Roman Legionary. The bold part controls the lethality of the attack. Anything less than 1 reduces the chances of the attack being successful and taking a hitpoint from the enemy unit. Anything more than 1 makes attacks easier. Reducing most weapons lethality to 0.6-0.7 results in longer battles, and adding a few points to a unit's mental stat means they'll fight for longer before routing.
In my own mod, I've currently gone further by redoing all unit stats from scratch to make things more balanced and interesting.
However, here's a basic export_descr_unit.txt file for version 1.5 of RTW that merely adds extra morale to all units (3-4 points) and reduces weapon lethality a bit. You can play around with the file yourself if you want to make battles last longer. Backup your original file first if you use it.
http://disko.co.uk/files/v15_edu_lowerkillrate1.zip
The file needs to be unzipped to your RTW\DATA folder and renamed to export_descr_unit.txt
Or you can just do it all yourself using a text editor like Notepad. Be warned that slowing down killrates in battles leads to units tiring much sooner, and it's not unusual for troops to become exhausted early in the battle.
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