In regards to your raid sorting query. This thread has some more information on what was intended, although it looks like it may have broken again.
http://www.wowinterface.com/forums/s...ad.php?t=29981
As to the displaying of the Group No I'll leave that to Scott to answer as I am not sure what is or is not possible there with the information nUI5 already has and the amount of code changes it would involve.
Forte Exorcist seems class specific so I doubt it will be included as part of nUI as nUI is not a class specific addon but a community wide addon. It should be able to work alongside nUI though like most other addons despite some of the functionality already being in nUI such as cooldowns etc. However, it may be possible to create a plugin to hold some if not all of the different windows into a panel. I'll flag it up as a possible project and when I am next in wow I will see how the addon works and see if its possible. Bear in mind though that if you have a panel for the addon you won't be able to see skada/omen/recount etc at the same time and thus perhaps not an ideal thing to do. Other than that did you have any other ideas about integrating it ? What does it do that nUI doesn't have for you in another form ? Perhaps it is something that can be done as a plugin for warlocks to use.