New performance UI, your thoughts?

[AdeptRogueNagi]

So with 4.2 out, I've only gotten a small session of trying out the new performance UI (as well as other things). I'm curious to know what you guys think of it. Here's a list of things that I've taken notes to (no pun intended). Note that all of this is still very new so things are subject to change.

Pros:
-Very responsive, no more delays between inputs (could use more testing). Playing faster songs are more accessible.
-4 different instruments to play (still playing the harp visually).
-No longer taking up slots in hotbar.

Cons:
-Octaves are separated so not all keys are shown like a keyboard would.
-Swapping octaves are locked with 3 keys: CTRL, Shift, and ALT.
-Still can't press keys simultaneously (not a real complaint for me).

Suggestions:
-Let us pick the keys that will swap the octaves.
-Have all keys in all octaves be key-bindable