Hi Chris,
I aced it with this…
[mashup width="100%" query="posts_per_page=25&category_name=members" directions="none" center_lat="10" center_lng="145" marker_link="false" zoom="2"]
Perfect.
Cheers,
Brendan
P.s. I have subscribed to your RSS feeds and will report some feature requests as I further expand my directory.