UVReactor Mod
The UVReactor Mod is a modifier based on the select modifier, except that this one supports UV editing using UVReactor. The functionality is complete regarding the UV editing. Due to the nature that it's a modifier, the system becomes somewhat slower.
Note
The editing is context free. This means that Editable Poly and non-instanced UVReactor modifiers can be modified at the same time. They don't have to share the same object.