Fabrik 3.8.1 has been released. It is mostly bug fixes and feature enhancements, but does include two new plugins (push notifications, and the sequence element). As usual we strongly recommend testing the new release on a sandbox if your application is mission critical, and always do an Akeeba backup before updating.
A sh404SEF adaptor file can be found in github in the folder components/com_fabrik/sef_ext. This has not be fully tested by the Fabrik team, and should be taken as alpha code (hence its exclusion from the current release zips)