Pressure curve for animated custom brush

[Gravin]

I'd like to see an option to use a profile curve for animated custom brushes when animation is set to "pressure" as it is now the animation is linear and extra steps or frames need to be added to the animation to correct for applications where a non linear transition across the pen pressure is desired. Having a profile curve to control the flow of animation would provide better control.

[Elodie]

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