Copy Blue, Copy Red and Copy Blue as Brush Paint Blend Modes?

Any chance we can get this added to Blender Texture Paint Blend Modes for brushes:
This is currently in Krita:

This enables you to paint in the 3 channels with direct and precise vaules.

In Blender currently, you can only paint with the Add and Subtract blend modes for channel painting:
rrr

The Add Blend Mode makes it difficult to blend vaules with soft brush when painting in say the RED channel or I want a specific value painted over a particular part I have painted on before in red.

This might be better suggested on right–click–select ??

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