The FS9 Documentation has this:
And the documentation I have does say that the Numpad1 and Numpad7 are the Elevator Trim. So, that's what I coded in my profile.
Have you tested this in Local Mode? If it works in Local Mode, but not in C/S mode, then it must be a bug. There is a
bug in the Hold buttons for C/S mode that I found when it was tested in C/S mode by a users. And a fix for that too.
You could also post your profile and I can take a look at it. I don't have FS installed, but I would be happy to take a look at it for you.
WBK
EDIT:
You and/or I could also test those Numpad keys using the Calculator as the game app.