Hi airdog - right now MoI is mostly focused on drawing/construction type operations, like drawing curves and then creating surfaces by sweeping, lofting, etc... - it currently is not focused so much on squishing surfaces directly with control points.
That's because a lot of the types of projects that you might squish points around for tend to work better in a polygon / subd type modeler instead of a NURBS modeler. But I do expect to add more stuff for point manipulation in the future.
In the meantime, it is possible to set up a squishy surface like you want by using the Extrude command with the special "Set path" option.
To do this, start by drawing 2 curves at right angles to one another, using Draw curve / Control points. Place as many control points along each one as you want in the final surface, like this:
Then select one of those curves, run Construct / Extrude, and then push the "Set path" option that appears in the upper-right options area. Then you can pick the other curve, and a surface will be created.
This surface will be a combination of the control points of both those input curves, like this:
So you can now manipulate those points to squish the surface around:
In the future I expect to update Add pt so that it will work on surfaces, right now it only works on curves.
But the type of objects that MoI uses (NURBS) always have a regular rectangular grid layout to their control points, it isn't possible to add just one single point in the middle of a surface, you have to add a whole row or column of points. That's the reason why polygon/sub-d type modeling is usually better for a lot of point squish type modeling, you are more free to connect up points there however you want.
Hope this helps though,
- Michael