there is a mod called moviebattles that specialises in roleplay. they have specialised moviebattles roleplay servers. it has really well made maps, models, etc. the downside is that its something like 1gb big so you can only get it if you have access to broadband and have the monthly usage cap to spare.
personally i havnt used it too much so i dont know what its like. i have tried some of the maps, and i can tell you they are quality as
another thing: its in beta. has been for ages.