I use it to have hybrid modifier and regular keys: if I hold down caps lock like a modifier key and strike another key then it behaves like control. If I tap caps lock like I would a letter key then it behaves like escape.

Return is another hybrid between itself and control (my keyboard does not have a right control key).

Space is another hybrid with a whole lot of bindings when held down. With s it generates space so that I can have key repeat for space (don’t need that often). With hjkl it generates the cursor keys.

Does this help?