title: Add custom Job to jobexecutor
body: <p>Is it possible (and if so: how) to add a custom Job to the jobexecutor in camunda BPM? My requirement is to execute a process-related Service by Timer or Loop. I do NOT want to model this in the BPMN directly, since it is not really part of the process. I could start additional arbitrary processes containing just one async Service task to archieve this, but I would prefer adding a method call containing the SOAP/REST/RMI call to the Job Queue Directly without the extra effort. Anyone tried this before? </p>