In WoW v1.8.0, there will be a new .toc field:
## SavedVariablesPerCharacter:
Which will save the SavedVariables files in WTF/[account name]/[character name]/SavedVariables/[addon name].lua
I have attached an image of how WoWUIDes could look like to support this new feature. It's a deliberatley editted screengrab, so it may look a little distorted.
Feedback please