Most 3d applications for modelling and/or sculpting 3d objects, have a feature that lets you mirror your actions from one part of the object to another.
This seems like it would be a very useful add on to the brush options.
The result would be, any brush stroke would mirror either vertical or horizontally on the canvas.
Why would you want this feature?
Well Im sure I cant think off all the uses some other users would come up with , but I would love to have it available to make symetrical textures, character and vehicle rough sketching, and it would be great when painting things like mirror frames, or complex moldings.
Im not sure if this feature has come up before, but I think many people in many fields would benefit from this.
Sounds like a very useful feature. Please do this.