I pick the call sign(to dwell), track ball enter to get the flight plan. When they check on I undwell. When I switch them, /0.
Others in my area:
1. dwell when they are on, undwell off
2. default /2, when they check on /1, /0 when off
3. others position the datablock accordingly(i.e 1,3,7,9 for off; 8,4,2,6 for on; /0 off)
4. other methods I don't care to list because too few use them(including check mark uret)
I think the use depends on how much you use the trackball or keyboard. Those that use the dwell method usually are trackball users, keyboardists usually use the / or position methods. I don't type as fast as I use the trackball.