LastManStanding would be the closest MWLL can come to a No ReSpawn configuration, though I do not believe that is the entire reason for the lack of BT members picking up the MOD. I'm leaning towards the simple fact that there are no MechLab present. Yes I'm completely ignoring the fact that a great number of the old BT members are simply not hardware-wisely up to par with, well, this community, though it seems they are getting there eventually, from all the LRM boaters that are tirelessly revisiting the servers.
One recent comment ingame comes to mind, "MWO will never be as good as MWLL, because MWO only has Mechs", and that's from a player who barely had installed the MOD ^^ and that is where MWLL will always have the edge over MWO imo.