I have wanted this feature for a while, I just think it could be super cool to have guild events in houses where its open PVP and I feel like it would encourage a whole different way of designing homes in wacky and zany ways with combat in mind amongst friends/guildies, IF we could just get a toggle to designate the entire premises as open combat.
I know I know.. you can already duel in housing but its just not the same having 1 person fight 1 other at a time and having to accept the duel which cancels out other PVP mechanics like stealth or turns combat pets into heat seeking nuisances that make stealth play impossible to achieve in housing.