I have a very small and pedantic suggestion for the way that the claiming interface works.
When you have already bought a claim, you can walk on that area without having the claim window close. However, if you want to claim a very large area all at once, and, say, you want to walk over to make sure you're claiming everything you want, the window closes as soon as you step off the blue area that's already been bought.
I suggest that prospective claims, like areas selected but not yet bought, also allow you to walk on them without the claim window automatically closing on you.