About search behavior, I liked it the way it was before, choose one and add all the songs... I think if you keep this the way it is now, it would be necessary to get the search bar available also in "Now Playing" so we can have the same function. This last thing I think would be really nice.
I'm missing this feature, it was one of the most used by me...
(If not possible to add search in play list, a setting for that (what I said before) in configuration should be available... )