Invert Sticking
Marching percussion arranger here, one feature that I think could be interesting to implement for percussion arranging is the ability to invert a selected sticking. For example, selecting sticking text reading "R,L,R,R" and then inverting the text would make the text instead read "L,R,L,L". This would be useful as it would make writing exercises with sections off the left hand easy to copy and paste, and would save some time in writing in stickings in manually.
Comments
This sound like something a plugin could be written for (assuming the plugin API dust around 4.x settles down)