In all honesty I haven't even read one single post about players being banned for even being afk during strikes or matches so I would seriously doubt not partaking during crucible would have consequences. I'm all about letting people play the way they want to, but if I can't anymore I guess I'll have to find other ways to amuse me, like f.e. dancing in the crucible. I could even state that while walking around doing nothing during matches I'm actually learning the maps, something everybody advised new pvp players to do...