Thanks Ehetyz!
And HeySlickThatsMe, the blood effects in the video are placeholders/tests, but I'll add a setting, something like low/medium/max maybe? Good idea, thanks!

Added a new short video (Preview2) to my first post showing the mod at this time, the peds are done, but I have to fix a couple of bugs, find a solution for a texture problem, add the ini stuff, and probably fix some more bugs after that, etc.
Let me know what you think and if you have any other suggestions.

Glad to see you guys are interested, and thank you for the suggestions njkellman and Ehetyz; a short answer is that most of them can and will be done

The long answer now! I will address your first suggestion last as it requires some explaining.
-The weapons that can/can't break up a body will be in an ini file, it should be easier to customise the mod that way. Some obvious weapons will be excluded in the code like knives, pistols, etc.
-Same thing can be done for the vehicles, either by vehicle name/type, or by vehicle speed , or both.
-Driving over an already dead ped does not break it right now (or shooting a dead ped). I tried to show it by driving over a dead ped in the video; however it is possible. I will include an option in the ini file thou, for those with a strong stomach.
-Now for the first part, right now the vehicle only breaks a body on death and at high speed, that means that on a high speed impact, as soon as the ped dies "on impact" and before it touches the ground, it is split in half. Now where the two halves go depends on the vehicle's speed, heading, etc. as they both obey the physics of the game; in the video I used a SUV so the upper part usually went over the front of the vehicle, and the lower one went under it. The game engine decides where they go but, it is possible to "help" a part into one or another direction (if that's what you meant?).

As for the explosion-related dismemberment Ehetyz, I will look into it, I did not think of it, but it totally makes sens, silly me hehe.

Thanks again, and let me know what you think!

Hey, I wanted to share a preview video of one of the mods I'm working on and see if it generates any interest as it would take a lot of time to finish it, this one I simply called Body Parts Everywhere.
The goal is to make the peds lose body parts based on where the player shoots them, or where the player vehicle hits them.
The mod is very graphic, if blood and violence is not your thing; well you have been warned. But remember, its just a game!
So far, the peds heads can come off if shot or hit, and the bodies can split in half if hit by vehicles (the vehicle speed is taken into account).
Next will be individual legs (left and right, about 50% done), and the same for the arms, but it takes a lot of time, even with my custom tools.
Here is the video:

Edit1
Here is a video showing the mod at this time, most of the heavy stuff is done, but still a lot to do.