Yep, I really hope RME won’t let this one slide for too much longer.
They've probably got a lot of things going on, and global OSC-control might not be at the top of their list. However, this would be a HUGE feature for many.
I've recommended RME gear to everyone asking for advice when buying audio interfaces. At least a couple of dozen of my friends and colleagues have ended up buying RME interfaces because I've convinced them to. Of course I don't consider this my merit, but one of RME's due to the quality and support of their gear being totally worth the praise. At the same time I've also explained the shortcomings and what would be possible by opening the remote functionality a little more.
I already know many music software-oriented people that would buy RME interfaces the very second global OSC was released, so I speak out for them as well. Not every potential buyer is shouting out on these forums for something that might be. Still, there really aren't alternatives for the kind of feature palette that TMFX with its flexible routings along with global OSC control would provide.
I root for RME and hope they can come out with an update.
All the best!
RME Fireface UFX+ | RME Fireface UFX | RME Babyface Pro |