I may have completely overlooked this, but couldn't find a rule or guidelines.
I've noticed that quite often group games fizzle out because one or two players leave, leaving behind a hole that even new recruits chomping at the bits cannot repair. So I'm wondering, for sake of continuity, can I demand as a GM that if a PC has not been posted for a certain, realistic time it reverts to GM control, or would that be against forum rules (regarding artistic ownership and such)