With the new autocapture nearest instrument (nice feature btw) it would be good to have a shortcut/ button/ context menu option to go to the next empty instrument slot. This may save a lot of scrolling when adding a new instrument to a long list.
I was thinking about this too. First I was thinking that when auto-catpture finds an empty track it could select an empty instrument slot. Then I realized this would probably drive you crazy. So I’d vote for your idea!