I last asked this 5 years ago, and I think it's sad that it's still not been implemented. I would like to have the favorites gallery be able to sort the submissions by the date they were submitted to DA.
When moving and rearranging images in favorites gallery, they get all jumbled up and when people don't tag their images, finding a particular image from them you faved can be rather difficult when you remember a rough timeframe you last seen it and the images that came after or before it but can't search for it. It would be rather easy to do this, just copy the same submission gallery coding over to the favorites gallery.
I've also looked for a 3rd party browser addon that could do this, but none have been made either.