Can tags used for product list outputs be combined?

Hello. I have searched quite extensively, but can’t find a way to combine tags in the Marketpress product list output. Putting something like this:

[mp_list_products tag=”deciduous”]

works fine, and outputs the list of products matching that tag, in a format like this:

“store/products/tag/deciduous/”

But when I put [… tag=”deciduous+dry”] no products are returned. If I type it directly in the url, for instance “tag/deciduous+dry/” , it only shows the tag typed first and ignores the rest.

To get to the point, is there a way of returning a product list of tags with AND logic, as with normal wordpress tags? The product search widget is great, but what I would really like is to be able to select multiple tags, and get the combined result of “yes, I am” products from each query.