You can organise your tracks manually into playlists, based upon whatever criteria you want (tracks can exist in multiple lists). You can also build dynamic lists based upon artist, genre, title, album or yeah - but not combinations of the above.
The ultimate flexible approach is to dynamically build playlists based upon a combination of criteria - we call this a Wendy Filter (you'll have to dig through our very early news bulletins to find out why) and it's expected to make a release in the not-too-distant future.
By the way, imho, playback flexibility with the car player is rather good even without the Wendy Filter.
Rob