Collaborative editing is really important to me and to my team as well. Codio crushes it on stability and speed. And I really like the editor. But I'd love to be able to pair on files and share a terminal right in the tool. (We use Cloud9 for this today, but that product isn't as stable or as fast as Codio Boxes).
I'd also like to be able to "Summon" collaborators to my cursor position. This is a feature we loved in Floobits (which we've stopped using because it was super unstable).
If you could solve this for us, it'd make our lives that much better.