Power Line Wall idea.
it would be nice to get a wall that had a 'gromet' that acted as a 'power pole' that you could connect 2 wires to and be able to go on either side of the wall to transfer power.
(The reasoning behind 2 wires would be to stop people from abusing them and using them instead of power poles as well as still allowing people to transfer power between wall in a clean and more flush manner)
Ladder Wall idea.
A wall with left side and/or right side ladders similar to the storage crates would be convenient and good for space.