I run multiple screen sessions each created with \'screen -S name\' and I would like to be able to display in the status bar the name>
As max_cantor says in the SuperUser Answer, an escape character for the session name should be added to version 4.1.0. It looks like the escape character function was added with a relatively small patch back in 2008. So if you're feeling brave, you can git yourself a copy of the development version 4.1.0 and try it out.
I'll try this with the development version when I get a chance.