more dynamic playlist options; artist search in playlists

[superboxmonkey]

Would like the ability to add songs to the end of an active playlist with options to make the default behavior never wipe the active playlist, and allow me to easily rearrange songs or groups of songs in the active playlist (for instance, put a full album after the currently playing song, even though there are a hundred songs already queued up after it), and the ability to quickly search and jump to a song in the active playlist (so if I feel like listening to all my soundtracks on shuffle, but want to start with that chuck berry song from Pulp Fiction, I could add a "soundtracks" playlist to the active playlist, then type in "chuck" and easily find it, rather than scrolling through a thousand songs to get to it).