Left clicking on a particular part of the note is difficult, since I do most of my note editing on the fly (during playback), and most of my note editing involves drum hits, which are very short.
Moving the event inspector onto the piano roll is not an ideal solution either, since it would sit on top of the piano roll even when not needed. Perhaps if there were a quick way to show/hide the event inspector, it would be less obtrusive, but it would still be a lot less convenient than a simple right click to open note properties. I might as well use the select tool instead of the smart tool.
Cakewalk had an efficient, intuitive system before: right click anywhere in a note to open the note properties. I wish they could give us the option to have that back.