1) AFAIK the key binding settings are always displayed if any are set. That's a game thing, not an UI thing, I think.
2) A: Process bars can be skinned with "progress_overlay_background" and "progress_overlay", but they do not work currently.
B & C: try looking at the selection graphics. Change one or remove the picture to see which picture is replaced by the "dummy graphics" (the light blue with white stripes), when you got the asset ID included in your XML.