"Only when idle" has limited usefulness, like if I was running a render or doing some music. But when I pause and go get a beverage or step outside, folding would start again. Even if I still had the game loaded. Some games don't like sharing space with the F@H GPU slots, and they'll crash.
Idle mode also won't help me when I just want to make a phone call and need 20 minutes of silence. I'll have to switch the monitors/mouse over to the machine and then use the machine often enough to keep it from going to screensaver mode. Too inconvenient, or I'd be doing it now.
What do you mean by "running the control remotely"?
I think we need a "snooze" button for F@H.