No, there's not a dual switch in the 29BHS.
Most of Keystone's entry level and mid level trailers have only one water pump switch. Some (not all) of the upper (luxury) units have a dual switch setup, most don't.
If it's an "OMG gotta go now" moment, whomever is doing the running is going to have to run past the water pump switch on the way through the door and into the bathroom. If the "urgency" is such that even that slight hesitation would result in disaster, there's really no harm in leaving the toilet "unflushed" and making the slower trip back to the pump switch and then returning to "do the post paperwork tasks".....
Alternatively, you could wire another switch into the circuit. Depending on your floorplan, it may be as easy as drilling a hole on the other side of the wall from the existing switch or it could be so involved that it becomes "not worth the effort and expense. I suppose each person would need to make that decision based on what's important to them.
But, no, very few Keystone models have a dual switched water pump setup.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS