Hi Craig,
Unfortunately, there isn't a way to do this. While Method has more fields, the Google Calendar only has a set number for us to work with. To get a full rundown of how the Method fields are synced over, please see our Google Calendar Help Center article.
If you click the link, you'll see that we actually include multiple Method fields into single Google Calendar fields to get the relevant information across. Perhaps in the future we'll be able to customize or configure this a bit more and we'll take this into consideration.
- Adam