ok I don't own a combat digi-Q, but in my roaming around cyberspace i have found this site explaning how to make an infared remote control jammer. This jammer may control or even stop the digi-Q from driving. i can't test it so i decided to post it here so someone with one could try it. If this works you could create a anti tank turrets or some sort of mine field that your tanks have to cross.
http://www.aaroncake.net/circuits/jammer.htm
if you think this will work try it and post your resaults.