Search with multiple values assigned to the same cck text facet

Hi, David!
I want to perform the search with multiple values assigned to the same cck text facet (like it realized in faceted_search module - for ex. I can perform search /drupal/results/author:1,2 - this query returns me a concatenation of author:1 and author:2). I want to get the same result with cck text facets (for ex. /drupal/results/field_city:"Paris","London"). If this is not difficult for you, may you plan to implement it? Thanks.