could you please consider a move (maybe create too) modifier which only allow moving a cc event to existing neighbour value. This allows control and precision in a very quick way and avoid in most cases the need of LFO panel or GUI scripts (at least me), because it is so quick and precise. Another use is doing a simple straight line.
(Envelopes would benefit with similar modifier)
In this example the drag would be only allowed (and actually visually moving) when the Y Axis reaches already existing CC values in this midi item.