Can we get the favourite date into the feeds?

I've noticed I can get an atom feed of my favourites, which is pretty useful.

However, I want to aggregate it with other feeds, and the dates on the feed entries reflect the date the pic was uploaded, rather than the date I favourited it.

I would be able to do the sorting myself if only the value were exposed in the feed.

Is there a way, or should I be submitting a feature request? I know that the date you added it is already in the database so maybe there is already some way to do this.

A feature request sounds like the way to go here.

Try going to trac.donmai.us. Hit "New Ticket", and fill out a feature request.