@dan Well, I finally took the leap to RW 7 and so far 7.2 seems remarkably stable and publishing is working fine. Great work and much appreciated! 
I did notice one possible very minor but annoying little bug though - if an HTML5 audio stack is set to autoplay it of course starts to play in preview, but now in RW 7 it continues to play when I switch back to edit mode and as far as i can tell there is now way to stop it playing in edit mode - it will continue to play until you open a different page in preview. In RW 6 the audio would stop playing in edit mode. This happens with both JW’s HTML5 audio stack and Stacks4Stacks’ Playlister.