There’s an existing feature suggestion discussing the lack of shuffle, play or add-to-playlist options while displaying a library by folder. The thread title of that suggestion however only emphasizes the shuffle aspect of the suggestion (edited that to make it more obvious).
I suggest you comment/vote in that thread in order to help us avoid distracting/cannibalizing votes.
Unless we might miss some unique aspect of your suggestion I’ll close this thread as a duplicate.
