Why to come up with such complicated ideas when all you need is to bring back reasonable experience for killing critters. As I remember, it took more than 15k 5mm ammo to level up ONE 21lvl BG char (also, BGs were more powerful in those times and centaurs/floaters had much less HPs). Now as ammo is a pain in the ass to craft, it's no longer a problem, because accumulating so much of it takes more than 1 day wasted on exping your char.
It was all started by making exp from killing critters diminishing.. FA exping and other "experience exploits" were discovered in order to make your 21 lvl pvp chars. Personally, I think it's pathetic when I have to repeat some stupid things like hitting something and healing it, or other ways to fast exp, instead of just making ammo and going to kill some creatures/raiders/marauders and such. But I'll still do it (like others who like pvp), because to fight effectively, I need 21 lvl powerbuilds as everyone else and I'm not going to fight in serious battles with 3 CH crafter char, despite of how big will be your mouth while speaking about "lame powerbuilds for brainless pvp players".