I actually kind of like the idea of different map lists for LWB and LWO, but I think somewhere it was mentioned that HTC thinks it would "split the community up". (Please correct me if I'm wrong)
As far as the localized "plane limit", how would you limit that? Just not allow planes to fly into that sector? I don't like that at all.
However, as a refinement to the idea, how about instead of a "plane limit" do a somewhat localized ENY? For instance, setting it so any more than... 12 planes per side in a 4 square radius affects a "localized" ENY modifier (due to attrition perhaps?). Doesn't stop you from bringing a Tempest to the party, but it makes you have to bring it from a sector away. Also think this should NOT affect CVs or GVs.
Again, don't know how I feel about it overall, but I suspect this would bring a HUGE number of complaints when you take off with your squad in 51Ds, get shot down, and then can't reunite with your squad in a D.