Here are 2 ideas for better usage of the Media Explorer in post production:
1) Make "Insert Portion (loop disabled)" selectable as standard drag&drop and/or action
I'd say in most cases in post production you'd want to be able to trim/expand the imported item.
2) Make portions of a sound be able to be dragged&dropped into other applications
As it is now, the whole source file is dragged out of Reaper. It would be great to be able to have a file written with just the selected portion of the sound.
This would make the Media Explorer the perfect substitute for apps like Soundminer, BaseHead etc. - Those apps are very expensive and people in post production might buy Reaper instead.