Would it be possible to set local and global Discover for each synchronized folder individually? I am considering to sync only large folders on the local network to save data volume.
You probably want something like https://github.com/syncthing/syncthing/issues/219, although that is per device and not per folder. Per folder would be tricky anyhow, currently…
Yes on Github is spoken about the problem of different IP in the same network … Perhaps it would be a way to sync specific folders only at a specific WiFi SSID?