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Hello,
Windows 7,
64 bit
TVPaint 10 Professional

I often want to use the transform tool to make a selection stretch vertical or horizontal, but not both.

This: always constrains proportions and becomes this: When possibly what I want is this: Any suggestions?

There are programs which create a new bounding box for each transformation (TVP, PS), and programs which remember the original bounding box from creating an item (AI). In the latter software you can stretch an ellipse the way you want. In TVP, you can either 1. turn the ellipse so its axes are parallel to XY, 2. elongate, 3. turn back to position. Or use the Warp tool.

I see now the warp tool, this answers my questions! Thank you!