It would be interesting to know if cubies are as picky as raspis when it comes to usb hubs for example... but yeah, it's understandable that you don't want to make everything stop just to test.
I only have two hubs, both of which work with keyboards attached. The 7 port Dlink that a lot of people use, and I have a usb 3.0 hub that works also.
So at least that usb 3.0 hubs works with a cubieboard. If it's not too much to ask, which brand/model is it?