After only two years, I finally realized why mouse entry of notes in the PRV remains an awkward, uncomfortable thing: it's because Sonar, alone maybe among all computer applications in the universe, uses a unique kind of position-and-place logic: 'snap' is done on a first mouse click: with snap set, your positioning click, the first click, causes cursor jump while the second click of what may seem like but isn't a standard computer double-click is the note entry. It's a subtle thing, but the source, perhaps, of one of the essential "I HATE SONAR" feelings.
I've read numberless complaints, fewer now since most people have moved beyond version 8 and earlier, about the loss of single click note entry. Maybe single note entry could be returned? Or at least reverse the 'snap' logic to a normal computer thing: you enter the note with click one, and snap, if set, happens on click two or release of the mouse if using click-and-drag.