Here is a screen of the rotation tool, you can see that the helper objects can change their forms and rotate the single bodyparts...

@Excessus: I will write my own "ent_animate" function, it should work like the real one, maybe I call it bone_animate or sth. else. The problem is, when I want to save it in the mdl, I need to write a dll plugin, but I am very uninformed in writing dlls. Furthermore, a lot of people will have problems, because the dll often doesn't work with different pc/windows settings.