Hi Malte,
the old interface was just for activating tree style (actually an mktree-based tree-style) and the "sections" style. The classical approach in such situation is to define a subclass, which has a more flexible interface but inherits the rest of the code.
Since there is not much code involved, i have updated the interface in cvs HEAD such one can use arbitrary category renderers. One can now define an arbitrary renderer (named ::xowiki::CategoryRenderer=$style) and pass the -style to the includelet. You can define the renderer in an arbitrary -procs file. Let me know, when you need more....
-gustaf neumann
PS: glad to see you back, i thought, we lost you to SAP.
