Benefits: Artists can more easily isolate parts of the UV map to operate on, using a selection method they will already be families with from other parts of Blender.
Description: With this option you could select UV's based on characteristics of the mesh, eg:
- Face Area
- UV Area
- Polygon Sides
- Pinned State
... possibly other options too, note that a subset of these can be accepted for the initial patch.
See mesh edit-mode, Select Grouped (Shift-G).
Challenges: adding key binding, operator and evaluating/comparing mesh data.