For me, one of the most tedious things about programming drums is setting each velocity to each note. All the clicking and dragging felt very time-consuming.
However, a few weeks ago I set up single key shortcuts for some velocity numbers and omg! It feels waay better now.
For example, if I wanna go from snare ghost to rimshot, I can just put the two notes and hit a shortcut to set the velocity value to 10 and another shortcut to set the velocity value to 120.
Hereās how that would look like:

How to set shortcuts to velocities
First, to get the scripts, import Archieās repository into: Extensions > ReaPack > Import a repository
github.com/ArchieScript/Archie_ReaScripts/raw/master/index.xml
Lastly, go to the Actions menu (Shortcut ?), select section MIDI Editor and set shortcuts to the following MIDI scripts:

Script: Archie_MidiEditor; Set selected notes velocity to X.lua
I have these shortcuts mapped to my top row numbers. This way I can just easily change velocities with my left hand. They are single key shortcuts too, so that makes it even easier š
šĀ Bonus tip: Adjust velocity with mouse wheel
Being able to adjust the velocity with your mouse wheel is also a big time saver! And it complements well with the previous workflow.
After using a velocity shortcut, sometimes I may want to fine tune further, and in that case Iād use my mouse wheel like this:

How to add shortcut to mouse wheel velocity
Go to the Actions menu (Shortcut ?), select section MIDI Editor and search for the following action:
Edit: Adjust value for events (mousewheel/MIDI controller only)
And set a shortcut to it. I am using shift + mousewheel.