Man you are killing it!
so I do love the idea of a mini map but more in the style of the maps in TES:Oblivion.
With a twist the map shows up but fades away after time because you forget and have to re open it to bring mini map up.
Also could try set walking to drop foot prints from what ever boots you are wearing . Would not be to hard to add.
Take the bottom of each foot wear turn to texture export as png with a simple "Photoshop overlay filter you can make texture of each ground texture. That can be linked to the walking sounds.
That can be added to change per boot/textureonly like four or 5 sound types