Ideas for Flipaclip

I think it would be extremely cool if Flipaclip had clipping layers. It would be so helpful for shading without going outside the lines, or for doing n effect to a certain area without any hassle. I also think there should be an airbrush! Airbrushes are so helpful for soft shading and would be so much easier as opposed to using a soft eraser. Just more brushes in general would be so cool! Lastly I think there should be a mirroring effect. For front-facing characters, I don't like having to copy, paste, and flip. I think there should be a symmetry ruler for that. Those are just my ideas. :)