Perhaps a page, in your power list, where you can add permissions to your beacons. That way, you could make it so only certain players can come to a beacon. (if clans are ever implemented, it would be neat to make it so only clan members could access the beacon. This could be used for spirit fights, where you dont want unwanted visitors.

May add more later. On my iPod right now. Anyone with One knows the hassle it is to type with it. But I think you already know what I mean.