ok, ive just tried Quintissential player, freeware from
[url]http://www.quinnware.com/[/url]
with the plugin "QueueIt"
and the whole thing works perfectly...it queues an album from right click play in orange, it will add a new album onto the old playlist, it can add a single track to a list, it plays on startup and it will delete the old playlist when you queue the first one...
try it