I don't particularly see a point in across-world party invites.

Let's face it, as it stands you can pretty much get to any normal or connected zone in under 3 minutes and can be in any region almost instantly.

Besides, there aren't any particularly useful zones where the nexus cape works anyways, although I'll still carry mine in /satchel for the very-very rare 'I need to use my nexus cape because I'm too lazy to walk' excuse.