Setting Up Saitek X52 buttons in FSX

I have FSX with FSX Acceleration installed on Win7 Home. When I try to set up which buttons do what in the FSX program, the list of options seems incomplete. For instance, I can't find reverse thrust in the list so I can assign a button for it. Also, I cannot seem to get the right thumb buttons (black one and 2 round ones) to do what I want. When I had Windows XP, I installed the Saitek program that came with the controller and set up the buttons from there, but it won't work on Win7 . Any ideas?