When creating a Point on Plane, it is possible to click-and-drag the point anywhere on the support surface. Is it be possible to expose this behavior in a controller? If not, it would be very useful.

I have a project where I would like to create xGen design sequences for non-designers. These users would largely work with the software through the "Experiment" tab. Being able to locate a point instead of manipulating dX and dY values (even using sliders) would be great for end users. I have the behavior in question below: