the directional control of the motor can be switched by the drum switch, but the issue is that you will need a secondary disconnect for the line connections
to wire for directional control:
disconnect the red wire at Motor Terminal 2, extend the wire and connect it to the Center Terminal of the Right Side for the Drum Switch
disconnect the black wire at Motor Terminal 5, extend the wire and connect it to the Center Terminal on the Left Side of the Drum Switch
connect a wire from the Top Right Drum Switch Terminal and extend it and connect it to Motor Terminal 2
connect a wire from the Bottom Left Drum Switch Terminal and extend it and connect it to Motor Terminal 5
this will complete directional control.
as far as wiring the secondary disconnect for the line connections, a simple 15a DPST toggle switch would suffice
the motor line connections are as follows:
Motor terminal 1= neutral (white)
Motor terminal 4= hot (Black)
for motor longevity,
i would recommend returning the drum switch to the center position and having the motor stop before switching the drum switch to the opposite direction
if you need clarification, i'm happy to assist in anyway i can