I got a little curious, and decided to test if the same was possible for a multivalue field. It turns out it's just as easy.
Instead of my regular demoapps, I'll post source code for the test XPage I made. It's bound to a form with one field, named field (don't name any field field in real applications!!).
To test it, create a form named Test with a field named field. Create an XPage/paste the source code from the file below. Click the add-button to add an item in the multivalue field. Save the document to test if it works. Not sure how many versions back this works with.
Demo XPage source code