I have a very slow upload speed (usually less than 500kbps). It would be very useful if we could post an app update via a CI service and not have to login to the dashboard at all. Maybe it is something you could think about for your roadmap.
I suppose the only issue would be someone spamming you with updates every time they commit code. I'm not sure what a good solution to that is, maybe accepting no more than a handful of apks a day?