Have your extra team members (besides the 2-3 needed for the robot) work on various projects for your team; there are a lot of other programming-related things besides the robot. Have them learn HTML, CSS, AJAX, PHP, and MySQL and work on creating a custom database-driven CMS for your team's website. Once that's onlline, work on creating all kinds of cool back-end features for team management. This is great for 2-3 programmers.
If you still have programmers left over, have them learn Flash and ActionScript, and create a Flash-based version of the current FRC or FTC game, like these from 2005 and 2006:
http://www.chiefdelphi.com/media/papers/1606
http://www.chiefdelphi.com/media/papers/1751