Ak selector plates are available in Auckland, last time I looked.
I think FA opens new opportunities at certain points in particular scenarios, being on semi most of the time but able to flick to FA when appropriate is something I'm looking forward to as I feel it adds to the realism.
One thing to consider is the extra stress and strains put on gearbox's, batteries and switch's though, especially for guns firing high FPS when running on FA for prolonged periods rather than periodic burst fire.