Thanks all for the replies.
My Turbulent has the same rudder pedals as ExSpeedBird's - I find them quite good for engine run-ups and low-speed maneuvering, but utterly impractical when trying to use them with the rudder pedals at any speed. I've read a description of rudder pedals that apply brake as they approach their limits which sounds a more sensible option to me, except it's not then clear how you apply brakes to both wheels to run up the engine.
I think I read your report of carb-icing (I think it was your write-up) before flying and it has kept me rather paranoid about using carb-heat - thank-you. My engine stopped once already whilst taxiing in wet grass.
I'm pondering a welding-brush, but fear it might make me unpopular if it started shedding bristles given that turbines and heavyish aircraft sometimes use the runway.
MothMinor's observation that you have no directional control towards the end of the landing run pleases me... If that's what was to be expected, then I find that paradoxically reassuring.