odvjetnik: both suggestions make perfect sense. Will try that later, unless you (or someone) wants to try them.
Triglav: is there 3, or 4, different wargs? I would try the armor things (maybe patches literally nailed on the poor animal?) but I need a concept. I can't picture it in my mind. Merlkir seemed to have a few ones in mind. As a concept, a rough paint over one of the rendering would do. Naturally, you (Merlkir, or anybody else) can go on directly editing the model and texture. I'll warn here before editing the models again myself.
FleshyStardish: I am not sure that the number of mounts actually surviving the battle influences the loot. Either case, I am not sure that good guys should be allowed wargs at all either -- even if currently they are (same for any evil guys equipment, when it comes to that). It seems wrong.
About the additions: maybe a technical solution to get most of the "+" features in the above list is to automatically spawn an invisible, zero-hit-box, unarmed, dummy rider directly riding any warg deprived of the rider. That dummy rider should belong to a third side (like in one of the native arena, which if is a 3sided free for all). That way, you get it all: the warg would actively seek victims, be hittable in melee, prevent the battle to end, and be a danger for its former masters as well. Unfortunately, it is probably difficult (or impossible) to make this dummy rider appear and disapper at proper times. It is just an extra possibility to by considered by the mod-savants out there, for 890 or for later versions.
AW?