Well, so I have to wait for Dave to have time to have a look at it .. thanks for all your afforts on this issue
I Managed all other customizations by reading the documentation and guiding articles here, they are really very helpful and complete.
It is just this thing that seems to break the "rules" how other templates work (with tokens) from my point of view...
I would have expected a "relateditems.template" that works like the "productlist.template" and could be implemented in the "productdetails.template" as a token like the Modelstable e.g: [TAG:RELATEDPRODUCTSTABLE]
Thanks again for the great product ... its really highly customizeable!
Gerald