Is there a way to set what sub galleries show up on show up on on the gallery preview? my guild loves to post pictures of there pets and kids, while i don't mind this i really don't think it is information i want scrolling on the main page of our guild site.

Currently, no. This is planned though (interestingly, there seem to be an increase in this request, so I can make it a higher priority).

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It's all in the reflexes.