Hey @uaid,
thanks for reaching out!
We are working on Webdav and SFTP support right now.
We will not offer a sync for files and pages, but we work on “Incremental Exports”, which solves the same problem in a different way (only exporting changes).
You can follow our roadmap right here: https://trello.com/b/soRCvM62/simply-static-roadmap
I’m not sure if multiple accounts will be possible anytime soon.
I understand the point, but since WordPress isn’t prepared for asynchronous tasks, it would bump the requirement for the feature to something most of our users will not have in terms of server capacity.
We keep that in mind, but there is no active development in that direction.
Cheers,
Patrick