I believe you can set the 'drum' track (15/16 usually) to metronome, and then have it 'play' either constantly (whethere or not recorder is playing) or WITH the recorder play button. However, I also believe it will continue until you shut it off with the track button (in the first scenario) or hit the stop button on the recorder.
Fender, thanks for the info...I don't really need it for punch in/out, because as was mentioned, that function is easily handled hands/feet-free. Stoppin and startin is what I am interested in, but it would also be good to be able to toggle the Record button with a footswitch. I sometimes put the recorder in a loop with the A/B button, with the punch -in/out INSIDE that loop somewhere. The section plays continuously, allowing you to practice and record over and over. But....the record button (obvioulsy) goes OFF at Punch OUT, so to get it back on, ya gotta take the hands off the guitar, hit the button at the beginning of the repeated loop, and then put them back. No big but a foot switch would be good for that function.