Hi,
Sorry, but I haven’t had that request before. It’s currently hard-coded as an either/or (only one of the two titles is sent to the map).
However – if you know PHP – you could use the filter ‘mappress_query_filter’ to adjust the map data sent to the mashup.
If you’d like to try that route, please let me know (or have a look at file ‘mappress_query.php’ where you can see both the filter call and the title selection).