lastly player created jerseys woukd be awesome.
If they're anything like the player created maps... there might be a couple good ones, but there'd be like 300 bad ones so the good ones would never be seen. Plus with that, it's too difficult to regulate what colors people use or what type of content people would add... It'll be like quake2 -- you can use custom skins, but other people must download and install them in order to see them, otherwise it will just use the default.
Equipment... that really depends on the map. Though one thing a lot of people don't realize is you don't have to be completely decked out to eliminate players. 40 ammo and a stingray is plenty if you just go easy on the trigger. Just grab what you need and go. One shot kills regardless of what weapon you use. Just learn to aim instead of spray
I'm personally strongly opposed to buying systems. Why? It makes the gap between skilled and new players even greater. If you have to score points to get money, the better players will be getting points and the new players will be stuck with pistols and pumps because they can't kill anybody, especially now that all the skilled players are using automatic weapons... it just makes things unbalanced. On the plus side, though, people would be forced to use low end weapons for at least a round or two on the crap maps that normally spawn you with autocockers...