Shear Shortcut (Ctrl+Shift+Alt+S)
Grab translates each island separately (given non-global transform orientation)
Rotate rotates each island separately.
Scale scales each island separately.
But shear shears island locations instead of islands themselves.
Not that I don't like such functionality, it's just not what is expected from it.
I see similarity to this:Maybe it could be implemented into Edit Mode for scale too? A lot of operators have additional controls, this could be the additional control for Scale, Rotate, Shear?