Yes. You can add additional fields to the editor by adding some code to your theme’s functions.php file. The code you need is:

function mlp_location_metaboxes_addnew( $meta_box_fields ) {
       //Add a text-box telephone field
       $meta_box_fields[] = array(
           'name' => 'Telephone',
           'id' => 'maplist_telephone',
           'type' => 'text'
       //Add an opening hours editor field
       $meta_box_fields[] = array(
           'name' => 'Opening hours',
           'id' => 'maplist_openinghours',
           'type' => 'wysiwyg',
           'options' => array(
              'wpautop' => true, // use wpautop?
              'media_buttons' => false, // show insert/upload button(s)
              'teeny' => true, // output the minimal editor config used in Press This
              'tinymce' => true

        return $meta_box_fields;

add_filter( 'mlp_location_metaboxes', 'mlp_location_metaboxes_addnew' );

For a full list of the field types you can use take a look at this page. Note: Map List Pro may not support all of the field types listed.