well ... here's what I know - might get you going.

Tools Menu / Options / Query Execution / "By Default, Open queries in SQLCMD mode" check box.

this will auto turn it on for new queries.

Now -- when you save this, it is saved to the SqlOptions file in your profile

C:\Documents and Settings\ \Application Data\Microsoft\Microsoft SQL Server\90\Tools\Shell

So, I suppose you could set the option, copy the file, turn off the option and you will have two options files to work with.