Here is my list of ideas :
-Base off DarkRP.
-Add a leveling system.
-Make better HUD.
-Make it so weapons from the store cost around 10x more than their normal price but make sure they are permanently in your inventory/equipped.
-Put it on rp_downtown_v3 or rp_downtown_v4c.
-Have armous which make your health/armor better. (Preferably base these off Halo.
)
These are pretty much the ideas I'd have for an RP server. I'm just not a good enough coder.