I'd love to do this as well. I created a ToText field for my User field which can operate as a dynamic filter, but not in the in the beautiful way that multiselect fields usually do--that is, to allow each option as it's own filter, rather than list all of the combinations as individual filters.
So, the list right now looks like, for example:
bob
bob;david
bob;david;susan
harry
harry;susan
susan
Any suggestions on how I can get a list that looks like:
Bob
David
Susan
Thanks!