Emulating cursor with keys

[Fabian]

I want to play SMG2 with two players. Usually computers only allow one cursor and even if they allow multiple, they are probably not supported by Dolphin.
But if I set keys to control the second player's cursor, I can only go to 9 different places on the screen. So my question is:
How can I properly control a cursor with keys?

[JosJuice]

Enable Relative Input.

If you're using the stable 5.0 version of Dolphin, you need to update to the latest development version in order for Relative Input to be available.