I'm working on a project that I would like to use FPS-style controls, i.e. continuous mouse movement in any direction. The traditional solution to this in SDL is to grab input and hide the cursor (respectively setGrab and setVisible in LOVE) - but LOVE doesn't have a way to get relative mouse motion, and the (invisible) cursor stops when it reaches the edge of the window, so taking deltas is out of the question as well.
Mouse motion events have already been ruled out I see, but it would be nice to at least have a "getRelativePosition" function, with the caveat that it should only be called once per frame.
This is personally a "blocker" issue for me right now, but I realize in the grand scheme of things it's pretty minor...