Don't know about the first one, but the second one you can just use the search thingy.
File > Preferences > Keyboard Shortcuts and change the shortcut for Edit/Search to something that makes sense. I've got it set to J, so when I press it when foobar is active you can filter the playlist by typing.

That little box pops up (There's 3 stitched together in the pic if you couldn't tell

), and it filters as you type (I wanted to listen to some Shinedown in that pic). Then just choose your song and it goes away
