It's easy to set up: put commands you want to be run whenever you join a raid in the GyroStartRaid macro, and the commands you want to be run whenever you leave a raid in the GyroEndRaid macro. (Gyro creates these macros for you automatically.)
For example, if you want CT_Timer to only show up when you're in a raid, use these macros:
GyroStartRaid: /timer show
GyroEndRaid: /timer hide
More details are in "Gyro.htm" which comes with the mod.