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For a few servos, a linear regulator (LM7805 or similar) would be fine to power them. [...]
Back EMF is handled in many cases with diodes to create a loop that lets the current bleed off from the coil in some manner. I'm not as familiar with motors but that is the reason you see a diode sitting across a relay coil in most example circuits.
Are you supposed to attach a separate battery and switching regulator to the "power bus" or something on the axon, which separately powers the servos?
However arduino boards don't have convenient power buses like the axon, so are there any solutions to this besides making your own?