JFI we use the aux. pumps during maintenance and they will quite nicely operate the gear and flaps, albeit not together. Due to the flow rate they are slow but are very useful to assist with rigging and/or leak checks. The only time they complain is on gear lowering when the pumps cannot keep up the flow rate as the legs freefall, so the legs will starts to 'bounce'. A bit disconcerting! For that reason its one leg at a time then there is not a problem.
Not an option in flight, of course.