Make JForum Portlet site aware

Hi devlist folks!

currently we are using Jahia's JForum portlet in our portal, and are quite
happy. Now we want to extend our portal solution that it supports more than
one site, on a single platform. For this reason we also want the
JForum-Portlet to be "site-aware" - i.e. on each site an administrator can
instantiate and configure a forum for it's own. E.g. If company A on site A
instantiates a forum it should not see or disturb forum content of company
B on site B, and vice versa.

I have thought about of adding a site_key field to each relevant JFORUM
TABLE, and passing somehow the current site_key to the JForum DAO's, so
that it can be considered within the queries. This solution has drawbacks,
because I have to change the DB-schema and make also many changes in the
JForum Source Code. Another problem are the caches, that JForum uses, I
think in a "site-aware" solution I have to disable them, which surely will
decrease perormance ..... Doing all this it will also make it difficult to
switch to a newer version of JForum portlet, if one will come...

So my question is, if anyone has a better advice, for accomplishing this
task.... ?

Or is there maybe another Portlet or template that fits more better for
"site-awareness" .....?

____
kind regards
Wilhelm Berger