I can only support the alphabet in theatre view! The touch and throw is not very reliable (I often end up going into an Album or Track rather than scrolling), even if it would be 100% reliable, it is just not practial at all to do this in a list that contains 2000 or more CDs just to move from A all the way down to another letter.
I am using a grouping on the first letter of the Artist so I can select the letter first on my touchscreen, but it would be easier to just jump with alphabet buttons if they would be available.
A permanent line of the letters A-Z at the buttom of the screen would help greatly, while we are at it if it also had the pause/play, stop and next/previous controls it would make theatre view with a touch screen a lot nicer for me to use. Right now I use a programmable remote and wireless keyboard to work around it, but it is less than ideal and clumsy in my opinion.
How about MC16 at least for this feature