What are some ways to work with / search flagged emails on iOS? The Mail App on iOS 5 adds support for flagging emails, but I can't seem to find a way to actually put this feature to use.

Is there a way to search for flagged emails?

Is there a way to cleverly auto-filter flagged emails into a folder?

I know that using GMail as an IMAP server automatically duplicates flagged messages in the "Starred" folder - but if you are using another email service, is there any way to make flags useful on iOS?
In iOS there's very little you can actually do with the flags except for visual cues.

On the Mac however, you can filter flagged email into a Smart Mailbox which will keep a live view of your mail matching search criteria, such as mail flags.