Even a skin that combines various elements isn't really ideal.
To break a moment to say that I have full respect for the modders, who do an excellent job with the tools available to them. None of what I say is against any of you.
To use a WAR screenshot I already have uploaded:
http://i174.photobucket.com/albums/w85/kirainotenshi/ScreenShot542.jpg
On that shot, I can see Squared, FPSbox and SoR.
Squared is the rather ugly grid of squares, which is actually an awesome party/warband healing addon.
FPSbox is the embarrassing white text that reminds me just how badly the game ran.
SoR is State of the Realm, which tracks the status of the server's RvR zones.
There were a ton of others I used, for cultivating and such. Each addon has different purposes, perhaps essential for one character, and pointless to another.
The feature JC and I are talking about is the ability to select what addons you want to use. If I didn't want one of the addons, I wouldn't have to have it, while if I wanted another, I could add it easily.
Edit: I did consider a possible workaround.
If standalone UI elements can be written, and saved in a subdirectory, could a custom "gump" be used to list all the subdirectories and allow them to be included?
I'm no expert, but it seems possible, with defined standards.
Although it would be better if support for it was implemented by the devs.