This idea just jumped into my mind. What if I could paint a reference point onto the screen, then drag it to a new position, and specify an elapsed time (in frames or seconds) and a movement style (linear, ease-in, ease-out, ease-in-out). With each new frame, ISM could show the current frame’s position along the line (or curve!). Allowing several of these at the same time would move something that normally is handled inside the animator’s mind into the program, and I think would allow less experienced animators to achieve higher quality results.
Excellent suggestion. Thank you very much!