Currently the Util Tracks are just able to generate RealTracks using the Soloist RT generator window.
You will need all the Generate options RT RD MST UT Loop.. with the Multi Tab Picker , when you right click "Choose Instrument Change for Selection" it will bring up the Multi Tab Picker.
So in the pic it will show where there is a track change and the name, the name will be offset if there is a Hold Shot etc..
So I can select the bars where the UT changes and Regenerate any section of the UserTrack same with RT RD MST.
Loops can be changed also in F5 or right click this will allow for another Loop or some Loops come with Holds Shots n Endings, so you can add these in.
I have asked for Hold and Ending in the Loops dialog to set the associated Hold and Ending wav file.

What else do you need in the Right click dialog ?
Full Screen