Mesh paint modifier

I would love to see mesh painting in blender. Possibly as a modifier. It could work as follows.

1. Select object you would like to paint on.
2. Add mesh paint modifier.
3. Select "Target object" (Mesh you would like to paint with).
4. Select orientation of painted meshes (Align to normals, or use a certain axis)
5. Begin painting the selected objects on to your mesh :)

Perhaps you can even have the option to select multiple target objects to use with mesh paint and randomize which one get's painted. Also have options to randomize the scale and rotation of the painted objects.

I feel this would would work great with foliage, hair, and such. I know I could definitely use this feature.

I would love to hear if others would find this as useful as I would! Feedback, suggestions and ideas to improve this would be appreciated!