Nice! Good work, thank you!
Now the only battlefield banners that are left vanilla in the mod are the battle banners for the "Slave" faction (i.e. minor clans and ronin), because the mod still uses the vanilla "pitchfork" banners from the main RTW Data folder ("Data/models/textures/standard_slave.tga" and "Data/models/textures/standard_slave_ally.tga" to be precise). But it could be easily corrected by assigning another, appropriate banners in "bi\shogun2\data\descr_banners.txt". For example we could copy "bi\shogun2\data\models\textures\standard_eastern_rebels.tga.dds" and its "_ally" counterpart (or "bi\shogun2\data\models\textures\standard_roman_rebels.tga.dds" and its "_ally" counterpart), rename the copies to something different (otherwise the game will use vanilla banners from BI) and point to them in descr_banners.txt (in lines 158-162):
faction slave
standard_texture models/textures/standard_minor_clans.tga
rebels_texture models/textures/standard_minor_clans.tga
routing_texture models/textures/standard_routing.tga
ally_texture models/textures/standard_minor_clans_ally.tga
Or you can create your own custom banners and point to them in descr_banners.txt.
Btw the banner files with an "_ally" affixes are not used in campaign battles AFAIK (I guess that they are used in historical or custom battles only, but IDK for sure), so they can be omitted. As well as the preferences.txt file, as the player may prefer his own preferences matched to his computer specs (resolution etc). I guess that it was included in the patch just to be sure that the arrow markers are not disabled in line 39:
DISABLE_ARROW_MARKERS:FALSE
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