Re: Filtering Google Analytics data in load script
The issue with that approach is all of the data will need to be served up by Google to then be ignored by the query. With a single dimension at a monthly granularity this probably wouldn't be a problem - but if you had a different query it would be a nightmare.
To do this properly the limitation needs to go in the URL that is passed to Google. This could be done in the connection, but it would not be possible to change it from one query to the next.
The only other approach is to disable "Standard Mode" which will allow you to modify the parameters of the query on the fly - but this is a security risk.