Yeh Ive just found that in the PRV screen at the lower portion where it shows the Velocity bars extending up,
you can zoom out just far enough to have the section you want to mess with,
drag your mouse across them selecting the notes,
then go up to the actual notes and hover with the smart tool until you see the Volume/Velocity adjustment,
you can then raise or lower the intensities of just those notes selected
I find it helpful when adjusting, editing, deleting multiple notes that this works great!!!
Also Ill have the Track View up on the other monitor so I can zoom way in and make sure Im on time if moving them (ie... Ill make a snare, rimshot, crash, ride track all on the same track) I can grab the snare notes and drag them in PRV to the right spot/note, then go down and grab the ride and do the same, etc.... Then bring up the mixer and get them all where they need to be on panning and so on. You can do alot dragging and selecting multiple notes fast.