My wishlist for a customized keyboard are basically
- full 24 function keys [1]
- two altgr/windows/meta/whatever keys (old windows 95 keyboards used to advertise this, then it went away)
- either 1 or 2 context menu keys
- analog volume control (wheel, not buttons)
- no full 1-inch border around the top/sides
- history back/forward buttons next to the arrow keys
- I don't care about mechanical keys, they're too loud.
- as a nice touch, include blank keys/caps for some of the function keys, to make them easier to relabel.