[Storebror]

You could always use the SAS "buttons" (they have two versions now, one Online and the second Offline), and they use the HSFX FM's. That way you can have your cake and eat it too, i.e. use UP 2.0 for all the planes and HSFX FM's for those planes.

Your's right and I did so when I've had the Wellington installed on UP 2.0. However the very first SAS buttons file with Wellington support looked like it was based on UP 2.0 buttons to me. However, I've seen some significant changes when using the latest SAS buttons in my HSFX 4.1 installation last friday, I'll have to check whether this can sort out all the FM problems I have with UP.

On the other hand, I've seen some discussions already where people argued the pro's and con's of having dedicated FM's together with the mods itself.
From my opinion, at least for offline flying, this would offer the great chance to have mods running to everybody's personal favour, without having to discuss about all FM's and DM's at the same time.

Best regards - Mike