When enabling Transmit over Blackmagic hardware devices, two things would be helpful:
more scaling options for non-standard frame sizes. i.e., it would be great to be able to set a 1080p output option and have an SD project fill the frame, or edit in a 4K scope timeline (4096x1716) and monitor it letterboxed on an HD display.
when stopping playback with Transmit over Blackmagic devices enabled, the playback stops a few frames after the command. Playback stops immediately without Transmit over Blackmagic devices enabled. Makes it hard to edit when you can't stop on the frame you intend to!