I send a patch last month which was i think has been merged to trunk and latest stable 4.0. This patch makes it compatible with newer versions of xmlrpc-c library. I tested myself with Debian 7.1 (wheezy).
And yes this patch is useful in a number of ways. For example I have been using it with openxcap to have xcap service running on different machine then sip service. I also have a few monitoring applications using mi_xmlrpc. Therefore, i would request to continue this module. I would be happy to provide any patches needed to keep it up to date with kamailio core and newer Linux distros.
Thank you.