[David603]

The single buttons file is already on its way, it will be included with the new unified mod pack that will replace HSFX, UP and the already defunct UI. Therefore this thread is pointless.

where you read it?

Its implied by there being only one mod pack, isn't it? Unless of course the UP people want to keep their own FMs, in which case there will probably be a switcher in the JSGME to allow people to choose from the default AAA/SAS/HSFX FMs and the altered UP FMs. SAS will probably continue producing updated buttons files to account for new aircraft being added between releases of the new mod pack, but there will only 1 FM per aircraft, or at most two.