Yes, I came to this forum with a few ideas in mind. May continue if I believe they are good enough. Also checked the DO NOT SUGGEST thread and believe that game modes (Other than Juggernaught) are welcome. Sorry for any misunderstanding.
Either way; Anyone ever played the old Half Life 2 mod, Sourceforts? For all unaware of the game, it goes like so:
First is a build phase, for a set amount of time players set up forts on the map, with items such as walls, ramps, towers, etc.
Next goes the battle phase: Basically a CTF game without the ability to add any more blocks. Blocks are repairable(?) but once a block is gone, it is gone for good. (Making the blocks stronger for this particular game mode may or may not be necessary)
This repeats until one team has captured the other's intel. After that the round ends.
All other opinions welcome!