I agree with pomco on making mobs drop more gils with every kill. This would eliminate some of the NM camping that you see on every server. I can probably say this for everyone that it would be a lot more fun to run around slaughtering countless goblins or beastmen with a hit or two instead of staying in one spot waiting countless hours for a NM to pop only to have it taken from you by a botter. Also, here is a funny thing, when you beat a botter to claim, they report YOU for cheating. Isn't that funny as hell? So yeah, if mobs did drop more gil that would help out a lot. That provides an easier way of getting the gil you need.
On another note, making more items either Rare, Exclusive, or R/Ex would help lower the camping on some NMs around the servers. I'm sure everyone can think of a lot of items that should be like that. I can't really think of much items right now, except for some that I have wanted/tried for in the past. One good item could be the Monster Signa.