UP... Selective sync based on the presence of a file in the root directory would be very cool !!! making the file name configurable per shared folder would be "cooler" ( maybe using regexp) Use cases: - Let's say I use keepassx to store secrets and I'd like to share the .kdb between my computers. with the requested feature implemented, as soon as I open the .kdb file, btsync would stop synching the folder - Dito for sharing a lightroom catalog between computers... as soon as the .lock file is created by lightroom when opening the catalog, the sync would pause and resume when Lightroom closes the catalog.