I find that on Serato there is a waste of space on widescreens which could have a super super useful feature.

Quicklists could be where you have a song you want to play soon but it is just not right for now but you cant be bothered to make a playlist for a few songs.
If you could implement this quick list feature where by you can place songs in this list and then they self delete on completion of play that would be amazing! the amount of times i have needed this feature is ridiculous!
An idea is here www.adelaidedjevents.com.au
Thanks!