Kinda, however... IF i remember correctly Cope said it was flat out impossible to add a 4th commander through conventional terms(ie adding just another race/button in the UI) or something along those lines, i tried to put up a team to add a 4th commander back then and you can find the thread on that in the main modding forum, in the end it's probably not worth all the trouble imo. It'd be better to come up with another system that doesn't involve the UI, iirc Miguel said it would be simple to make a menu in game where you could select your starting commander, i'd guess it could be similar to the CoH doctrines but without the fancy UI.
And as for adding new races it probably would be simpler to replace commanders with a whole race, similar to how in the Chaos race some commanders have access to stuff others have, so in other words making it so that the commander slots are races slots, not sure how feasible that is since it's code stuff but in theory it should be possible, but even then if we started making full races mods right now probably none of them would be finished by the time DoW III.
Anyway, i don't really have a visual update mainly because i'm too lazy to make a video but the FC's cape is almost completely animated with the sword/gun combo(not really hard, just tedious), so then i'd just have to animate the cape with the power fist animations and he would have a permanent cape in MP, i've also added a loincloth to make Veterans or to simply give it to the FC, so when i'm done with this it will be pretty easy to make veterans or give the FC his cape permanently.