IRL the mossie had issues with the yaw axis,DH knew of the problem but to correct it would have required shutting down production.
If you look at the DH Hornet or sea hornet you will see the they added a fillet to the verticle stab. The way the mossie was manufactured didn't allow them to just add it on as they did with many other A/C.
As Bozon said the mossie before it's FM was fixed could swap ends at will and was relatively easy to recover,I think Bozon meant to say add down elevator trim instead of forward trim.He is correct that CT does not help it dials in full up elevator making negative elevator or nose down difficult at best,flaps just add to this so I usually retract them first thing.
Normally you don't need to shut engines down but if you cant stop the rotation with rudder then it's not a bad idea,dropping gear has always seemed to work for me when I cant stop the rotation with rudder alone.
The mossie pilots were warned to be careful with rudder inputs,it was said that the mossie would bite you if you weren't careful with rudder inputs.
I haven't flown the mossie a lot lately but I used to fly it all the time,I have a personal connection with the beast and it will always be a fav of mine.