We could add a button to rescan when when know new files have been added.
Sure. That would also expose an API endpoint, i.e. a HTTP POST to something like /rest/rescan?repo=foo would be what happens when that button is clicked.
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see also: https://github.com/calmh/syncthing/issues/9#issuecomment-43063303
With this, it should be possible to create a inotify watcher that request /rest/rescan?repo=foo 