The gimbal used to move the tracking scope around is actually quite an ingenious design. I have several tripod heads, some with knobs to twist, others with a pistol grip to move the scope on the ballhead, and a few simple ballheads. They work fine, for what they are, and if that's all you want to use, simply lock the gimbal on the tracking scope and have at it. But my experience has been that it's easier and much more intuitive to use the gimbal mount to move the tracking scope if you need small adjustments. Nothing to press, unlock, or release. Also, I have seen people mounting a couple of devices on a tripod, it's nice to be able to move the tracking scope without moving the entire head with the other doodads on it.
I'm thinking of a head with two screws, one for my spotting scope and the other for the tracking scope.