Sounds fun, I like slower paced FPS games where strategy is a big element, capture the flag variants are always fun - but yeah, we can do with some fresh elements.
Battling for control of anything tends not to be too much fun unless your playing human opponents - AI just isn't good enough yet to make it fun, human vs human is the way to go and have any bots supporting the humans. I hate when a lone bot runs off into the enemy base just to get a sniper slug in the back of the head.
The unreal series tried to give you authority over the bots but it just does'nt work as well as it could. What would be awesome is if the bots could scout ahead a little and just warn you about enemies, like they might scoot ahead and peek around the corner and give a hand signal (Vietnam GI style) that the other bots react to.
I really like the system in Rainbow Six 3 where you point and send your support there, probably worth copying.
One of my favourite FPS games ever for deathmatch was DukeNukem3D, I still haven't found a game that let you be anywhere as sneaky. You had trip mines to stick to walls, and pipe bombs that could be clustered together - just with those 2 weapons you can have a great deal of violent fun laying traps for your enemies. Some sort of indirect killing solution would be good, like sentry guns ala Aliens, or maybe debilitating gasses that you can pump into the air remotely or through a sorta smoke grenade. Eventually a losing team will want to hide somewhere and a few different ways to tackle that would be cool.
A must is security cameras, you should give each block a security room - like one player might want to sit watching the cameras and warning the other players. Cameras rarely get used to good effect in FPS games, the only game that springs to mind with cool cameras is Timesplitters2.
I reckon you should go for it and start working on this - or even save it for FPSC and whatever add-ons it provides for DBPro (besides the media and levels). FPSC should be a pretty good package for anyone writing an FPS in DBPro - does away with all the BSP headaches.
Van-B
The nature of Monkey was irrepressible!.