More like the plugin Manager.
I don't see anything hierarchical about the drum map manager when in fact there is a tree like structure.
Mouse up and down can change values. Drag and drop everywhere etc. Velocity can be more like velocity in the track view, in fact make the whole thing look like the rest of the main interface like track view, and less like a dialogue box. You could redo the whole of the preferences like this to make it look more attractive (think Komplete preferences or something).
Cheers...