As whe are checking te playlist manualy after creation, and making changes to it, it would be more handier to split the DB screen vertical in stead of horizontal.
In that way you could open the playlist f.i. on the left and database on the right hand side.
Above or even in the center line a directory window, or even better on top of the track db , a pulldown menu where you can select criteria.
As it is now, you have a lot of white space left of the playlist tracks, evt info there is not current for playlist editing.