Looks like a great layout ! I never played Ultima series or Might and Magic, but now I want to try !
For your mouse concern, the Mouse widget allow you to do that (setting the duration to ‘permanent’). It should work but I never tested.
I encourage you to finish your layouts. You look like to be able to say you mastered Magic Dosbox soon. Pixel Traps will be the next level of your mastering XD.