Is it possibly to create a new sub-gallery in the photo gallery that is for Guild members only? Or something like it?

At the moment, I'm afraid not.

This is something that I am getting a lot of requests for lately. Currently we have an area for pics to be uploaded, but a number of members have asked if we could have a Guild-only area so that they could upload personal pics of themselves, families and guild get-togethers that we've had. However, since these are pictures of real people they wanted to limit it to guild members only for privacy reasons.

A feature like this would be greatly appreciated I am sure.

Anyone else have a need or desire for such a feature or am I alone here?

I'll put it on the list.

Nope, you're not alone. I've had the same request from my guildies for the same reasons. I've also had a request for a Vent status box that only members can view. Is that possible as well?

Vent status is hideable. You only need to use an advanced layout and put a rank=# tag schema on it. This will make it so that it is only view able by that rank or higher.
<!-- System:IfRank:XXX --> This must have an accompanying <!--System:EndIfRank-->. Whatever is placed between these two commands will only be displayed if the currently logged in user's 'rank ID' is at least XXX. For example, if you were to do <!--System:IfRank:3-->Test<!--System:EndIfRank-->, then 'Test' would only display for those who are ranked 3, 2 or 1