Provide a way to select staff/part directly from piano roll editor

When fine-tuning playback of a score, the piano-roll allows to tweak note durations much more precisely than with conventional articulations. The only problem is that in order to work on a staff one must select a measure on the staff and click on the piano-roll entry from the contextual menu, even if the piano roll editor is already open. But if changes need to be done to the content of several staves, one must go back and repeat the selection once and again for all the involved staves. It would be nice that part selection could be made directly within the piano roll editor.