Showing posts with multiple tags

I currently use the plugin to show posts that contain a given tag. I’ve found multiple times where I’d like to display only posts that contain two or more specified tags.

I tried using tag=”tag1, tag2″ but that OR’s the tags rather than ANDing them. Is there any way to AND the tags? If not, could that functionality be added?

syntax could be something like:

tag=”+tag1, +tag2, …” or tag=”AND(tag1, tag2, …)”

Thanks!