In the RB Tracks window, it would be useful to be able to highlight a list of tracks (e.g. shift-click, ctrl-click) and have a way to size the selected tracks vertically in one event.

Perhaps a menu option under Edit - Track... called "Set track height for selected track(s)".

-and/or-

Perhaps be able to click and drag one of the selected tracks to a new size, and have whatever this new size is be copied to the other selected tracks.

-and/or-

Perhaps be able to click the "disclose" triangle on one of the selected tracks and have it resize all selected tracks accordingly.