It's good if library actions will pass event or at least key modifiers to providers.
For example:
-move action may works differently if move with some key down (for example shift) and without modifier, like with align
and without align, but have no information of starting event or state of keys during mouse move event.
-or move action may try to keep vertical/horizontal, diagonal movement with some keys down (like drawing in some
graphics tool)
-resize action may keep aspect ratio with one modifier, make sizes equal with other and allow free resize without
-or resize action may finish with strict final size or just a suggested final size depending on modifier
etc