Hiding/Showing portals for players based on årivate, friends, guilds?

[Sketaful]

I love how easy and well XPortal works. The problem is that it kinda remove any chance of having portals hidden for those special places you like to be alone no matter if it's a giant server or just some friends playing.

I would love if, first and all, it was possible to somehow mark a portal as private making it only show up in your own list. If other players check portal destinations they shouldn't see it. It's the main thing I'd want to be able to do.

As an after thought, since I play around with some more modded server I'd like to see the private portals be expanded to support friends and guilds as choices to be shown to. The ability to only show your portals for guild mates and so on like support for ex. Smoothbrains Guilds and/or Groups mods. ;)