The idea is, to give the user the possibility to create a personal signature, based on several templates. That happens on a website.
The user then copies the signature manually to the corresponding dialog. So it would be easier, if the user must not navigate through the menus.
I couldn’t find a way to set a signature by code. The token you suggest, has not the functionality I need. (A user could have more than one signature for example.) I know it might work with SOAP, but I couldn’t find proper documentation and it seems to be too complex, compared to the output.
Have you looked at our Multiple Signatures (http://advansyscorp.com/formativ_sol_multiple_signatures.htm) solution? It lets you to create and choose from several signatures, define a default signature (plain text or HTML) to be automatically inserted when you run the solution. You can also integrate the solution with Message OnSend event then disable the GroupWise signature, so the personal signature will be added when you send the message.
All Advansys solutions provided as free, fully featured 30-day trial software. Please feel free to test the solution to see whether it meets your requirements.