I know this is sorta a dead topic but I was just browsing and saw this and considering I stunt as much as I race I have to put my imput...
From personal experience and the experience of some of my friends, a dedicated stunt server is a BAD idea. In your case it might be ok though, because you have so many people with rcon capabilities you could easily keep it under control as long as one of you is in there and that that person knows what he/she is doing.
And also if you know a few things then mods are not necessary unless you're looking for impossible thrills
In that case a modded stunt server is you're best option. The best to start out with is definetly Development Trainer (devmod) which can be easily found by googling it or getting it from a friend (add my xfire if you want it (soldier88midget)). Good luck in you're quest to getting one