Had a quick look around and searched couldn't find any thread for custom match idea's so I though I'd start one :)
Here you can post all your idea's for custom matches in RA2, these matches are different to your normal death matches, king of the hills etc. I'll throw one out there to get the ball rolling.
One Fall Boxing - A Boxing ring arena would be used, the canvas instantly destroys a bot when the chassis hits the floor so players build boxing robots that "stand up" on wheeled legs and feet. Objective is simple knock down the other robot, think about robots jabbing each other and throwing hooks while the other moves around and dodges the puches of the other bot with head movements.
It would be fun to have more custom matches to play around with, open up some more gameplay options for different/more unique robots.