[Rich Breen]

I know of no software that automatically does this (which doesn't mean it doesn't exist), but here's a few thoughts: If you want markers at clip boundaries, you could easily make a macro in Keyboard Maestro that would tab through on a track and drop markers at every clip start/end. If you need to drop markers at silence, I could imagine a macro that used Strip Silence to separate the clips, then tabbing through to drop markers.