At first, thanks for your reply, especially "What I still don't like" is useful for me!
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The bodyparts, especially the right arm spins around when I get to close to a box
I have not seen this bug, when you post a screenshot it would be great!
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woman lands in the water beein not able to react to my keyboard inputs
Just download the "simple Test Demo", there you can control her with keyboard inputs in the water.
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The woman does not stand without movement and jumps a little all the time
The movement looks strange because she behaves like a doll made of gum when I slow her down.
There is another possibility to remove these problems. Instead of the physic-body-parts, I could make one big bounding box which moves with the player and than when he is killed, the ragdoll-movement starts. So, there would be no more jittering, but you don't have a collision with the body parts, only with the bounding box.
I think, this way is used in a lot of games, like "max payne 2", "unreal tournament2004", "farcry" and other games with physics. 
