Is there a simple way to completely disable the ability of an ownCloud client to sync i.e. the only way to access files will be to use the web front end, clients on desktop or mobile will not sync at all?
If you edit your .htaccess file in the ownlCloud folder you can add the following:
RewriteRule ^remote.php/webdav/(.*) /index.php [R=403,NC,L]
This will disable Webdav and Desktop sync clients, only allowing the web front end for users.
Awesome, thanks man!