Yes Customization, that sounds good to me.

It's all doable, I know when I make usertracks I do that to have a lot of different endings available.

The Holds now just have 1 hold and 4 shots that that program chooses from. I remember before they had holds I had to create an ending in the chord I needed then copy and paste it for a hold.

In the Tips n Tricks somewhere there is a Drums Solos, fills, Intros and long Endings.

and actually there are some on
www.realband.org/drums.html
www.realband.org/tutorial-drums1.html