The Edit | Create Custom Selection option lets you change the selection marquee size and position. It would be useful if some of these option could be changed using the keyboard. For example:

  1. Press CTRL to display corner handles that can be moved with the cursor
  2. CTRL + SHIFT to allow handle movement, but locking the aspect ratio
  3. CTRL + ALT to allow handle movement, but forcing a square marquee

It would also be nice if:

  1. The Custom Selection window could display as a dockable window, so that sizings could be changed during editing/moving the marquee.
  2. The selection supported feathering, so that pasted images blended better with the destination
  3. There was an option for different shaped marquees such as (a) circle (b) freehand.