Some ideas only:
1st An respawn msg if all cars will be respawned like "All cars will be respawned in 10 sec"
2nd For a long time i asked something like , when will the server get Gang Zones? Or will this come with a big update later?
3rd Will we get Neon on our parked/tuned cars soon ?
4th Money lottery. Means You can buy a lotto number on the banks to win 1.000.000$
5th Reducing spawnweapon ammo on some guns. (e.g. Sawn-off) instead of +100 bullets only 66 bullets
6th Carhouse. Adding special Cars into it to get bought like a car what doesn't exit on our Server (e.g. Comet, Blade)
7th Buy your own color on the server (long time, maybe roban changed his meaning about it :b)
8th Adding some Language Packs (e.g. Sweden because ENG/SWE)
Please say which suggestion sucks and which is a little bit good
