> is it possible to inser a Linebreak after the paragraph-style?
If you're using the LaTeX document classes then the answer is "not
easily". I've done it myself by modifying the article.cls file (and
calling it myarticle.cls). It's quite easy if you know any TeX: I just
copied the definition of \subsubsection over that for \paragraph.
Koma-script might have an option for this sort of thing, but I don't know.
I'll happily send you the myarticle.cls file if you like.
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http://www.cl.cam.ac.uk/users/rrt1001/ | certain, a. insufficiently analysed