Fair enough. Then let's give incentives for players who recruit friends,
I believe we already do, but giving a strong incentive is just an incentive to multicheat.
and allow existing players to have 2 nobles on Dwilight.
Nope. Not gonna happen. This is something we discussed and decided on some time ago: a big part of Dwilight's uniqueness comes from the fact that you can't have two characters there, one propping up the other, or creating an inextricably tangled web of alliances like you see on AT and EC.
Because without central authority the population would descend into lawlessness and anarchy. The lord's role is to manage the region. If it's not being managed then it's, by definition, rogue. Also, it's contrary to your overarching goal to increase noble density.
Not having a lord isn't the same thing as rogue. Nor should it be. The region is still part of the realm, and as such, it
does have central authority. There's just not a Lord or knights overseeing that central authority. So, sure, some corruption's going to occur, but that's a long way from lawlessness and anarchy.
And in case you haven't noticed, I've been achieving the goal of increasing noble density by other means.