How about a real guild claim system....

concegual

Claiming keeps at the moment is quite mundane. Create a new type of Alliance points that go to guilds specifically. Each person who chooses to picks the guild they represent. When they gain points in Cyrodil it also adds to the guilds points. These points in turn are used to enhance a keep or resources defenses and offenses...Make it possible for these guilds to maintain ownership of said keep or resource so long as they have the points to maintain defenses. This will stop or at least slow night capping. Each siege merchant of a claimed Keep already gives access to the guild store... Make it worth guilds taking advantage of this. The current system makes the guild store option worthless being the moment no one is around its easy enough to pv-door Cyrodil back to the gates... This would build some Alliance/ guild pride. Have alerts pop up on screen when your guilds keep is being attacked so everyone can call to arms and go defend.
Obviously the amount of points spent should equal the defense/ offense options available. There should also be daily costs to maintain these defenses... no more points the keep becomes vulnerable and is more easily captured... or claimed by a guild who can maintain it.

Claire

I'd like to see larger defense capabilities available the closer the keep is to the gate, e.g. for team blue, Rayles would have more/bigger options than Glade, etc. Perhaps limit the claiming to faction home keeps, too.