...because it is basic utility (interface control), all the mods are under it.
Most of the people play with IT and know: ALT+LMB on the cell of inventory = drop all the stuff of this cell. ALT+CTRL+SHIFT+LMB = drop all the stacks of this type from your inventory. It is very usefull and often used for some years - it is standart. I can not beleave that you do not know it. Are you only programmer - not player? :)
In the Quark we rarely change "Favorite Item" in the inventory. That is why we need to change the keybind ALT+LMB to some other - like CTRL+(some letter)+LMB or smth else.
Thanx.

totally agree