Is it possible to adjust Mercury Transmit settings for playback on external monitors?

Adobe doesn’t actually do ‘anything’ to the T-O image. So other than the Sync options Richard pointed out, there isn’t anything to adjust or set.

The way BM sets their software for the Decklinks can be fun too, as at times that requires incoming data to conform to some unexpected data set, which of course Resolve knows and will use, but ... no other software auto-knows this. I think it’s part of BMs entire attempt to set up as nearly an isolated BM “ecosphere” as possible. Like ... all their tabletop hardware only works with Resolve, you can’t use their panels with any other software.

As I work for/with/teach pro colorists, most of them based in Resolve, and most of them have Decklinks and also most other NLEs installed so they can fix problems on incoming projects ... I hear a lot about issues with Decklink and other apps. 

There are a couple of options in the Premiere preferences for sync issues.

No, it´s not possible.

The idea with BMD cards is to get 100% quality, always, and thats why they not have included any options to degrade the output. Changing Sequence preview settings or any other setting inside Premiere do not change this fact. If you have problems with the output from the BMD card, A/V sync issues, you should contact BMD support.

I can´t check now, but i don´t think there is a setting for A/V sync in the app for the BMD card.