The thing that prevents you from resting is a debuff that mobs set on youupon agro from what i understand. Any other kind of detrimentals active on you will also prevent you to enter OOC regen mode.
Assuming you can find a way to block the debuff or make the server believe it's gone, then you can always be in ooc mode. By ex for now, i believe that if you camp and relog (or die, rez, wait for rez effect to wear off) it will put you back to ooc mode even though you had a 5 min timer (raid encounter).
I didn't try it with /fade but i assume it would put you back instantly to resting mode.