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Quick question, I'm just investigating the new stuff whilst I have some free time, with the colour group option, is there any way to pick the second colour? So the shade isn't always black? I know you can do that with the gradient group, but the light source moving about is nice. Unless I'm just doing it wrong and I should use both?

If you are not using the Gradient Group, you can only change the color of the light, not the shadow. The only way to change the shadow color in the Highlight is in the Gradient Group.

In this example I disabled the Color group to use only the Gradient Group:
I chose to use 3 different colors in my gradient, the white being the light, the blue the color of my form and the red my shadow.
I set the profile as such to give a depth impression with the Highlight and get a better display of the different colors of my gradient.
If you wish to animate your Highlight, you need to generate keys with the Angle value.

If you're talking about the clipping mask then the stencil function is the same in TVPaint isn't it?

@Dan : Not really. Stencils are an interesting solution, but not in that specific case.

If Bestazy wants to use the Highlight, he should better create an extra top layer combine the Fx "colour > image source", define that source to be a coloured layer (or anything else), then add the Highlight (with the option " light only" ticked).

Ah ok, I do that by duplicating the matte / colour layer and then doing the highlight on that dupe layer, with light only selected.

That's possible too