Very interested in the app. I use Scrivener with MultiMarkDown extensively for my Thesis.
One thing I couldn't tell - do you allow syncing with external folders?
In Scrivener I use the sync as text file feature, and then do bulk editing in Sublime Text, and then sync it back into Scrivener.
Would such a workflow be possible?
I see that you have import from MultiMarkDown, and export to MultiMarkDown, so hopefully most of the core functionality is there.