As much as I personally understand the need for effective project management workflows in open source projects, a) I don't think GitHub necessarily has to be extended for that purpose, and b) I'm convinced there's no point trying to tell a private enterprise what they should do or not. I remember being mad at Automattic for them "wasting" 100k on a "useless" domain. Did it change anything besides my own hormones? Of course not. That's not how business works. Need or want don't define business planning, profit does. Tell GitHub how a better +1 UI will enhance their profits instead of letting them know why you need it, and those features likely go into active development by tomorrow. :P