Good idea! Now part of my mod pack :-)

See https://mods.factorio.com/mod/schmitts-modpack

Always annoyed me that those useless dead bodies where lying around everywhere felt forever.

Glad to see!
If you have some suggestions or bugs, let me know, i will do what i can.

Feels correct. I have set the fade time to 10 and delete time to 20 seconds. After 10 seconds the bodies now slowly disappear and fluently go over to deleted state while fading out :-) In other words: There is now no waiting time between fading and deleting anymore.

That's how base game works anyway. I can rewrite the settings a bit, so instead of "general time" and "fading time" there will be "living time" and "fading time", then general time will be sum of these two (maybe this will even be less confusing for people), but i'm not sure that it is needed. I doubt that someone realy need such precision. Pretty sure most people just set something like 30/10 or 300/15 and that's will be ok.

Main reason i wrote this was that there already similar mod, but it doesn't properly work with shading and many modded cheatures.

No need to do anything. Your mod is fine as it is :-) Thanks!