servlet mapping Jahia servlet

Hi all,

Working with a 4.1.0_01 version of jahia, I would like to change the servlet 
mapping of the jahia servlet.
Default the servlet maps to /Jahia/*, making that "Jahia" appears in all 
urls. 
I want this replaced by an empty string, so that 
http://myserver/mycontext/pid/1 maps to the servlet.
In jahia405 I did this by mapping like this:

<param-name>defaultMappingPattern</param-name>
<param-value></param-value>

(I also changed the other mappings further on in web.xml)

Now in 4.1 this doesn't seem to work.

If I do it like this:
<param-name>defaultMappingPattern</param-name>
<param-value>/*</param-value>
it does work, but all images referenced in the templates like /jsp/jahia/... 
are also processed by the jahia servlet (resulting in a 404 error).

Any idea how i can solve this?

thanks
Tom