Night Mode, the site is blindingly white with little black text. It's harsh on the eyes and in some people can cause migraines. Offering a night mode option would improve the site quality of life.
I was thinking a little Moon icon next to the gear, you click it and the page darkens and the text changes to white. Then the moon icon changes to a sun, click the sun and it turns back to it's default color scheme.
This would be great on all of the sites, actually.