05-04-2016, 02:30 AM
If you look in the general settings of FsP, you can edit or remove any key mappings that may conflict with your other FSX key maps. I've had to do this as well. Sometimes other addons will have their own key maps that will certainly conflict. You just have to figure out which ones. It's not that many key maps in FsP. Sorry you are frustrated with it but the program is worth the effort.
See FsPassengers Frequently Asked Questions: FAQ