First paragraph, the stealth thing is beyond modding abilities, afaik. I didn't ever see a coding line that adressed it. So it would be CA's task to make something here.
Second paragraph, the injuries and wounded item is reflected with the replenishment of men. More detailled modding is in this regard, iirc., not possible. However, i'll try to look at it, if i go back to the files for a next update, perhaps there is something, i believe there was something for AI battle calculation, i mean to remember i applied such codes as well for the autocalcs, but well, they do not count for real played out battles by human and AI.
Modding is limited to just what open files offer.