Midi controller graphs

When I have the Key Editor open and edit notes through the piano roll I often want to draw curves for Midi controls such as Expression, Modulation, etc.

The problem I have is that when drawing using line or freehand tool in the midi controller window beneath the piano roll the current quantize setting is used to create a staircase effect for the graphs. I can manually increase the quantize to say 1/64 every time I wish to draw a curve, but I feel even this resolution isn’t sufficient.

Is there any way to have a nice graph working at the highest resolution instead preferably with dragable key vertices rather than this low resolution staircase?