I don't know if this was done for a reason but there is a slight inconsistancy between NOTES and DRUMS
If in the DRUMS window, you can click on a drum name and it selects all the drums (notes) for that drum.
If you could perhaps select the forceps tool (and/or arrow) in NOTES mode and be able to click the piano roll and select all the notes of that key, that would be handy. Holding the shift down select a few would also be handy. This would be a lot easier than dragging an area with the forceps tool which could get unwanted notes included.
Doing my little testing I think I found an odd difference between the 2 windows when selecting.
If you drag across some notes with the arrow tool in NOTES and switch to DRUMS, the notes selected are still highlighted.........and if you go DRUMS to NOTES with a selection it works fine as well.
BUT
If you select some notes with the forceps tool and switch to the drum window, it selects an area lower (1 or 2 octaves down) on the screen....and vice versa.