Ok, I have an idea (brace yourselves.)
Instead of two bases, there's just one base, right in the middle of the spawn points. This way, you have both teams fighting over the objective, but it still retains the capping mechanic. Perhaps you could even make the cap time a little longer to prevent a light rush.
Not sure how it would go in testing, but on paper it does seem a little better than each team sticking together and going at it straight team death match style, and just hoping that the enemy didn't slip by them to cap the base.
Edited by Moromillas, 29 March 2013 - 04:29 PM.