Though you probably already know but the two most important changes in my eyes are:
1- Remove Rapid Fire from the Ammo Gem ( This is the single most important change in my view, as until rapid fire has its bugs fixed it is simply too unpredictable to be useful and in fact is actually detrimental to players, thus it needs to go)
2- Dramatic alterations to the ammo limitations. Either unlimited ammo or a significant increase to both spawning ammo and the ammo GEM award. (Note while I agree with Mike in principle about the balancing of ammo and energy and actually like that aspect of it, I also see the opposing view that the ammo is currently too restrictive to allow people to play all the various styles out there)
-Aztec
aka: "Nate"