To enable the alternate channels on an IFI operator interface from 2005-2008, you have to have the team number set to a value of 2048 or higher, so that the most significant bit is a one. (If you change the team number to meet this requirement, remember that you'll have to tether the robot so that the RC can recognize the change.)
Here is what my cheat sheet says about the channel dipswitch settings:
Code:
1 2 3 4 Channel
X ON ON ON 04
X ON ON OFF 13
X ON OFF ON 22
X ON OFF OFF 31
X OFF ON ON 40
X OFF ON OFF 01
X OFF OFF ON 40
X OFF OFF OFF 40
This information is in the IFI control system documentation.