SOAP & XML-RPC "login as" a given user

We have implemented a SOAP API that will cause Perforce triggers to push work-logs and state transitions on JIRA. The problem is that we're doing this with a dummy SOAP user (trigger-user) to accomplish these SOAP calls.

There should be a way to allow that dummy SOAP user (which contains admin privileges) to login and execute SOAP commands on behalf of a user that way the work-log and state transitions being made can be tracked as the user as oppose to the dummy user.