I was going to open another thread to ask for pixel art scaling options, but I had a "deja vu", so I searched here, and yeah, as usual, you made what I wanted even before I knew it XD
I have been trying the omniscale option to scale up pixel art and it's amazing! :D 
Why are you not telling people that PixelOver have this feature on the main page? Seriously, this is great! :D
Having said that, would it be possible in the future to add also some other scaling algorithms? Not all of them act the same and some ones could be better for certain specific art than others. Maybe you could use even Rotsprite (even if it's not a real time algorithm, you could put a warning maybe?).
Just in case it's useful, some examples and interesting info here (you'd probably know them already though):
https://en.wikipedia.org/wiki/Pixel-art_scaling_algorithms
https://www.datagenetics.com/blog/december32013/index.html
Edit: I have just seen it, you have it announced on the main page with "Transformation/Deformation. Stay pixel-perfect when rescale, rotate or deform an object.". Nice ^^