I think the simulator controls work fine as they are, but if this is considered I'd suggest modifying it to:
1st Click = Standard Rate Turn
2nd Click = (opposite direction) Roll-out of SRT
2nd Click (same direction) = Double Rate Turn
Third Click = Triple Rate Turn
Effectively, each click would be a standard rate increase or decrease in the direction the arrow pointed. I think it would be counterintuitive if I clicked once on the right arrow I'd turn right, but if I clicked the right arrow again, I'd go left.