Just thought of a new one ;-)

How about a "quick load button" for each channel, so there must be a "quick load button A" and a "quick load button A".
Should work like this:

first choose a track like a jingle or scratch samples and load it on a "quick load button" maybe by drag and drop. The "quick load button" will remember your selection on any following session until you change it.

O.K. pressing the "quick load button" while djing will map the previously made selection to the specific deck. pressing it again the deck will return to the track it has loaded before.

Advantage is, that you don't need to scroll around in your library just for loading a scratch sample or a jingle. It is already prepared via "quick load button".

This would be fantastic, 'cause you can switch very quickly between your prepared track to play and scratching your jingle into your mix - how about that?