I made some programs for better integration of syncthing with owncloud.
The first program uses syncthings event interface to scan synced files in owncloud so they are instantly available there.
The second program is a versioner compatible with ownclouds versioning. Versions generated by syncthing are named like owncloud versions so they can be seen in the web interface. Trash is currently not supported: When syncthing deletes a file it is still put in the versions folder but owncloud does not display them, you need to browse the version folder on the file system to see those… It includes a clean program to automatically clean versions like the staggered versioner does.
Code and release can be found here: https://github.com/alex2108/syncthing-owncloud
If you need a release for another system (currently only linux 64bit available) tell me, but the chance you need to build yourself is high since running php for the scanner possibly has to be done in another way…