Hi Fabian.
"getWorkFlowTemplates" seems to be only a convinient method to get the list of templates "easaly" from a given chg/iss category.
Nevertheless, you should be able to get the same infomation using doSelect:
factory:wftpl
whereclause :" object_type='cr' and object_attrval='<id of request area>' "
Hope that helps
Regards
..........Michael