Thank you for your interest in 3D Pixel Anim :-)
1&2- you can hold the ALT key to speed things up, SHIFT gives you more precision, CTRL speeds thing but less than ALT
3- the output is pixel perfect afaik, having 1k or even 2k textures help getting crisp images. You can also use vertex colors
4- this feature is available in latest version V1.3 (just released)
Peace!