Michael,

When attempting to create a blend curve between 2 curves the result can be unexpected if they have been selected using a marquee selection, because the closest endpoints of the input curves are determined to be endpoints of the new blend curve, regardless of the curve direction

I know that you loath to introduce new functionality if it complicated the UI/UX, but please consider (if you can see the value in it) of including a check box that appears only in the instance of marquee selection of input curves, that reads something like- "Use Curve Direction". See image below:



Obviously, this is a trivial matter compared to the release of the final beta, but if this suggestion is practical, both in the senses of achievable & of practical use to others, please consider it for inclusion to a future update.

Thanks, James
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