When editing in the editor window (piano roll), the feature I am suggesting allows for a vertical line, that follows the mouse without a click activation, to be seen. This allows for exact placement of articulation key-switches within the editor window simply by aiming the mouse cursor on the note and clicking on the key-switch position on the piano roll. This would remove the step of clicking on the note and then finding the key-switch.
Because key-switches always fall outside the key range of an instrument, it is difficult to align the key-switch without first selecting the note and then placing the key-switch before it in order to activate it. This process does provide a vertical line in Studio 1, but it would be simpler if the vertical line was always following the movement of the mouse on the piano roll. I have used this feature (Aim Assist) in Cakewalk Sonar and found it very convenient and time-saving, especially when composing for instruments where articulations can occur frequently in any given passage.
The 'enable cross-hair cursor for tools' feature in Studio 1 does not provide the vertical line in the editor window in the manner I have described.