Currently there is a fixed list of shortcut actions, this would make more sense divided into a combination of multiple actions and modifiers.

The current shortcut types are:

MOVE_EVERYTHING,
MOVE_ONE_STACK,
MOVE_ONE_ITEM,
MOVE_UP,
MOVE_DOWN,
MOVE_TO_SPECIFIC_HOTBAR_SLOT,
DROP;

DROP and MOVE represent different categories of action, UP, DOWN, and SPECIFIC_HOTBAR_SLOT are modifiers for the MOVE action, and ALL_ITEMS, EVERYTHING, ONE_STACK, and ONE_ITEM specify the amount of items to perform the action on.

It would be more sensible to represent shortcut actions with these categories distinctly separated, to enable work on #34