With multiple unit types selected, the default key to change unit selection based on type is the mouse scroll wheel. I’d like to be able to change that key so unit selection can be more precise in microing units in a larger fight. I am unable to locate the keybinding in the options menu but I do see a “change default scroll wheel function” but no new options become available, nor can you change what that function is. For reference, when you change the configuration to “yes” the mouse wheel zooms in and our versus changing unit types in a selection.
This is for a mouse and keyboard setup on a PC.