Manually linking Contacts to issues

I'm using contacts and hepldesk plugin and would like to know if there is a way to link a manually created issue (possibly as a result of a phonecall0 to a know contact ?

The helpdesk email route is working but seems over kill if all I want to do is link the issue I've just created with a contact.

similary if I've created an issue via helpdesk email, how can I display the associated contact when viewing/updating the issue ?