I agree, and while I think I understand the reasons for the switch to using Adobe's DNG Converter for RAW rendering, after searching all over this forum, it is so slow and such a resource hog that I generally leave it turned off and just work with RAW+JPG or JPG previews.
However, it would be really great if when the 'Q' shortcut returns, if it functioned as a render-raw-on-demand button, i.e. rather than just slamming through an entire contact sheet and rendering every RAW, if PM only invoked DNG Converter after 'Q' was pressed on an image while previewing it....