I saw your video on YouTube as well. How do you taxi the Ju52 without spinning?
I'll tell you honestly that I'm not very used to taxiing on taxiways with the Ju52. That's why I'd rather post here what IPACS advises, if you haven't seen it yet.
Differential Throttle and Brakes
The Ju-52 has a free castering tailwheel with no steering control. To steer left and right pilots use differential throttle and brakes. A little more throttle on the right engine will cause it to turn to the left and vice versa. Rudder becomes more effective if you increase throttle on the center engine.
Imagine having to wash one with all those corrugations! No muddy short fields for me.
You are right, although mud is not yet implemented in this simulator.