Bummer!
Till, can you guide me where do I find the php file that creates the nginx .conf directives.

desperately I just needed this wildcard feature for our communications team to do it by themselves, if this is not too tedious to modify everytime a new ISPConfig version comes out I would rather hack the code. I would just like to remove the $1 it added to the redirect path and everything should work as I want it to be.
Oh, and a question, why does the script add $1 to the end of the rewrite nginx directive by the way? Nginx supposed to know what index file to load regardless it is specified or not.
Big thanks Till!