Actualllllllllly it IS possible to do it!
Asked the same quastion at UBI forums and here's what you do.
Create a QMB.
Fly it.
Once finished save it as .TRK (not a quick recorded ntrk) and call it something you can 'find'
Now, open your Records folder and find the .TRK you just created.
Rename it, removing the .TRK extension and changing it .mis
Copy it into your Missions/Quicks folder.
Open FMB and load the new file you created.
FMB now has a QMB mission loaded into it, which you can tweak to add and remove whatever you want.
Now save it. You can fly your QMB created mission.
Cheers, MP.
(PS this wasn't my solution, just repeating what WTE_Galway at UBI forums told me.....but it works!)
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