Atm colkind uses BBoxMode, so sprites like this:

Are exported like this:

In this example, because the BBoxMode is 2, colkind is also set to 2

Precise   - <colkind>0</colkind>
Rectangle - <colkind>1</colkind>
Ellipse   - <colkind>2</colkind>
Diamond   - <colkind>3</colkind>

Not sure how to fix this as UMT can't tell what the mask shape is

But it does know if the sprite uses a separate collision mask (values here), so:

• if sprite.SepMasks == 1 (Precise), <colkind> = 0
• if sprite.SepMasks == 0 (AxisAlignedRect ie. Rectangle), <colkind> = 1

It's not perfect as Precise is also used for Ellipses and Diamond. But we know at least when Rectangle is being used, and Precise is probably a safe default in any other case.