Not sure if it's possible from the Metro app (runs differently from the desktop player - seems pointless having two of everything IMHO). I know how to change it to Winamp and iTunes and the desktop version of WMP, though. Personally I only use iTunes because I have an iPod and now it has my whole library and everything sorted, I'm too lazy to find anything else!
Sure. If you haven't done this before it may be a bit tricky and I can do it if you tell me how much you want it moved by.
If you look through the .ini file, there are three bits you want (shadow,cover and glare). Each of these should have an X= something below. If you increase that number for each one by the same amount, you should be able to move them when the skin is refreshed.