Well, we were all in DM mode, and I came up with a few ideas:
Ranking Up: When you get so many kills, you go up a rank.
Buying Weapons: You can purchase weapons that you want, but some are only unlocked to buy when you achieve a certain rank.
E.G Pistols you can buy streight away, aswell as mp5 etc. AK is unlocked after ranking up a little more, and costs more, all the way up to buying a minigun at the highest rank. And a weapon you spawn with like an mp5.
Multiple GROUND respawn points: You respawn on the ground, but there's like 5 respawn points. That's it - Thanks.