We currently offer a massive range of downloads for FSX, as well as older flight simulator add-ons for the ever-popular FS2004, FS2002, CFS3 and now becoming ever popular with dediced virtual aviators is Laminar Research's X-Plane series.
Go into FSX, set it up as you want.... then save the settings.
Then go into your folder with the fsx.cfg - Make a copy and call it "fsx_xxx" xxx = the controller name you want. Now go into FSX and set it up for the next controller, and do the same, only name it accordingly for your next controller and so forth...
then when you want to call up certain FSX.cfg files, you just rename the original fsx.cfg file to fsx.bak (for backup) and rename the file with the controller you want from fsx_xxxx.cfg to fsx.cfg - When you are done, you change it back to fsx_xxxx.cfg and change the fsx.bak back to fsx.cfg