The range tool in the project window allows you to select multiple parts/events across multiple tracks, but in the key editor, such a tool doesn’t exist. Would you please add it? It would help to select controller data on multiple controller lanes. Thank you.
GIF (what I would like to do)
The translucent selection rectangle doesn’t get past the lane where I started the selection… 
Would be nice if I didn’t have to use a PLE preset.
