@jeffca,
The function to display the map is:
bp_event_map( $event=false, $width=250, $height=250, $zoom=8 )
So if you put some parameters into the call in event-home.php file in the member template (line 46) you can change the size/zoom.
I am working on a category system where users can pick any number of categories or create a new one (like the WP backend for posts), and will create a template tag for that, and I am keeping an eye on the Content Tag project in the works….