FYI: If you wan't to recursively both power the RPi with the hub and control the hub with your RPi at the same time just cut the red wire in the uplink cable.
-P +-------+
| | |
| c |
| | |
+-------+ |
| hub | | < SOLUTION: Cut the red wire here!
+-------+ |
| | | | |
p o o o |
| |
| +-----+ |
+-| RPi |-+
+-----+
o = other "power hungry" devices
P = PSU power
p = USB power
c = hub controller
For my part o = 1xBE USB and 2x50GH BFL, I hope the RPi will be able to run them!
That shouldn't be necessary -- both my RPIs are powered from the hub they control without any issues so far. (Although that might depend on the hub...) I've never heard of anyone having to cut wires for this sort of thing to work.