Something in the code has made it so non-default keys will fail to work reliably when replacing a default keybind. This is especially the case with keycombos like stance modifier + direction. I, for instance, can't set my stance modifier to anything other than LCtrl or it will fail to work (unless I only bind it for modifying the stance in a single direction, which it will then cooperate for). This has been the case for multiple months now and has not been fixed. Chalk it up to developer incompetence.