Any interest in a check_boxes helper?

So I currently have these helpers in MetaSearch because I use them when I create search forms myself, but I extracted them the other day for a post on and I started to wonder why we don't already have something like this in Rails. Is the general consensus that this kind of stuff should remain plugin-only because it doesn't directly map to a single HTML entity?

Basically, it's just a check_boxes and collection_check_boxes method for FormBuilder that works pretty much like select :multiple => true but without sucking so badly in the UX department.