In XBMC there is a add-on for the download of subtitles.
When I switch RasPLEX to the OpenElec mode and look for a Add-on it does not show one.
Is their a way of getting the some of the Add-on's in RasPLEX or do I need to go back to Plexbmc, I hope not as RasPLEX has a more 1:1 interface to Plex on my Mac.
Direct-play or transcoding is a client (not a PMS) setting. You may try to enable the “force-tanscoding” option within the settings but this may require a powerful PMS…
There is currently no good solution available. You should create a feature request at the PlexHT forum to get this feature into PlexHT (and thus RasPlex too).