I have one problem with the way Musicbee acts when you start typing.
The current behaviour seems to be that it starts writing in the search field located in the top right-hand corner. That would not be that much of a problem for me if it didn't modify the now playing list when you click on search result. I want my now playing list to keep all the library tracks not just the search result.
One way is to make an option that lets the user chose how the now playing list acts.
The other way and the one I prefer the most is to use the same behaviour that itunes and winamp used the last time I checked (so long long ago).
It basically acts like windows explorer, you start typing and it jumps to the track starting with the letters you typed. There's a slight difference in what explorer does in that it is more advanced. You sort by artist and start typing it jumps to the track with that artist, you sort by title it jumps to the corresponding track with that title and the same goes for every field. With this method you will just use the search field when you need something more specific concerning multiple fields (but again even in this case I would like an option to force the now playing list to keep all library tracks)
A mix of both methods would be ideal and offer much more flexibility.