After I got all the keys configured with a macro I wrote myself, and added them to the standard.xml file, everything worked fine except that I was missing the fuel pump toggle. After I tried to add that, FSX always resets the keys to defaults. Even after removing it, it still does it.
I'll have to go through the keyboard section of the controls line by line :P
In other news, I am trying to hook up an old laptop as a fourth monitor, for outside views, using the ZoneScreen software.