"The select notes pencil" "W" allows a note to be dropped into a grid, and keeping the left mouse clicker down you can move the note up/down/left/right to a new grid before releasing, the note will be the one you select from the note value row meaning whole/half/quarter/eighth and so on.
With the "paint notes" paintbrush (also "W") you click the note into a grid then have the option of dragging the note value to longer/shorter before releasing the left mouse clicker, its a "freehand" method.
So basically the "W" refers to both pencil and paintbrush that can be slightly confusing, maybe a different hot key for paintbrush can be used ?

NOT A BUG!