[Wild.Bill.Kelso]

Weird.... I set my TrackIR up to use this key to center as well, about 3 months ago. I didn't use it with TB though. It worked with the keyboard for me, but I changed it back to the Windows Apps key on the right side of the spacebar. So, TrackIR can see these keys when they are pressed. But for you, TB won't send them.

Try mixing them up?:

macro = predef:RCONTROL, KEYDOWN
macro = {SCROLL}
macro = predef:RCONTROL, KEYUP


Also, I just tried this with my keyboard manually. Without the Control keys, the ScrollLock light goes on and off. With the Control Keys it doesn't. I don't know what to tell you.

I use:
Left Windows Key to Pause TIR.
Right Windows Key to Center.
Apps Key for Precision.