I most always use Sync-Start, but rarely used Sync-Stop until the advent of Yamaha's Freeplay styles, which really benefit from it.

If I want a one bar stop/fill without needing a foot-switch, I generally program it into one of the Intros, or I'll use Ending I, hitting one of the main variation buttons before it ends completely.

I use two foot-switches/pedals on my Tyros4...one for sustain, and the other for volume.

Ian