Default Category Map Icon – Multiselect

Hi,

I am trying to alternatives to ajax-chained for selecting categories on the add listing page as some of my users have found it confusing to use. I am testing the Multiselect option but it doesn’t seem to have an option for selecting a default category. This was useful because you could control the icon that displayed on the map. How does Multiselect determine the default category? Is there some way of controlling the default category?

Thanks