Nick: I did this to mine yesterday, and it came out pretty good...my camera sucks, so no good pics of it...and yes, all of the buttons on the screen are accessable thru the remote.
-Take the button pad out of the case, unconnect, ect...
-Bend the IR sensor so its perpendicular to the board.
-Gently grab the sensor with pliers and heat up the connections on the other side with a soldering gun....wiggle the sensor around as you do this and get it free from the board.
-Get some wire - I used part of an old IDE cable.
-Strip the ends and then heat the holes up on the board and get the wires in there where the sensor's pins were. (I didn't need extra solder, you may though.)
-Trim off any extra wire sticking through on the other side of the board.
-Solder the wires to the sensor....to protect them from shorting I coated them in some random expoy lying around....you can use tape/whatever though.
And - auto poweron by coyote (I'm sure youve seen it, but while youve got the case open.... :P)
http://www.mp3car.com/vbulletin/lcd-display/24047-my-solution-auto-power-lilliput-screen.html