Eventually, I will release a version of Email Template Editor for SMF 2.0, although I am working on much more important things; especially since it works with emulate anyways.
Regarding the variables that can be sent in test emails, as I explained in the help text (I think?) the only variables that can be passed using the Test Email Template are the GLOBAL variables, all other variables are not global, and would have to be honed to a specific file, this would cause many more edits required for the mod, and then would still not fully allow all variables to be used, this is the way it will always be, unfortunately, and I apologize for the inconvenience.
Best Regards,
Labradoodle-360