If we added custom fields to workers (as planned) then signatures could use any of those fields to display info like this.
Similar request in the forums:
http://www.cerb4.com/forums/showpost.php?p=12397&postcount=1
While researching for him, I found several ideas for personalized signatures, but if we go with worker custom fields that sounds like the ultimate solution. I'm going to link them for now so we can later merge them if need be.
Add a personal phone extension field to signatures.
http://wgmdev.com/jira/browse/CHD-734
More specific data fields at the worker
http://wgmdev.com/jira/browse/CHD-1092
personal signature for workers
http://wgmdev.com/jira/browse/CHD-700
Adding a worker custom field can do this already. Only admin can edit them. But the option exists for some time.
Thanks
Robert