cursor() feedback

Tame question:  Is there any way to get return code type information from
cursor()?

I'm using cursor to define ignore regions for fitting, so I keep clicking on
pairs of points, and each pair of points is considered an ignore region.  The
trick is to know when I've finished selecting regions.

I've decided that clicking on the same "pixel" twice (basically,
double-clicking) indicates that I'm done.  (Hitting "q" also apparently returns
the position of the mouse, but I still have to hit it twice.)  Alternately, I
can click in special regions, but those are tricky to define.

If there is a way to get this information, it would be useful for implementing
state machines (such as the simple one I've described) that involve
point-clicking.

Thanks,
Rob

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