Is a mashup map of markers possible?

First off, sorry for my Dr. Suess of a title.

Second, I'm not sure if this should be a feature request, or if there's a workaround, so let me know:

I've tried the mashup feature of this plugin, and it displays several separate maps depending on the query at hand. That works as expected, right? What I want to do is show all the markers from all maps I've made on one map. Is there a shortcode that takes care of this, or am I shooting in the dark?