Real-Time Symmetry/One-Time-Click Mirror
Many pixel-art character sprites are symmetrical. A real-time drawing symmetry or one-time click to mirror image is a useful function and will speed up workflow drastically considering one wouldn't have to copy/flip/move every certain number of edits(or try to make edits symmetrically manually)). Thanks, PyxelEdit is awesome. I use it rather than Photoshop because of the real-time animation function and tile based system.