RE: Steerable landing gear
Just make sure you don't have to much steering on the nose wheel. About 5 to 10 Degrees is all you want. More than that, it gets really hard to steer.
On the tail wheels, not all planes can stear with rudder only on the ground. Life is so much easier if there is a stearable tail wheel. A plane like my 4*60 will turn into a cross wind once it has landed if the tail wheel is not planted firmly on the ground. I have become so accustomed to touching down, then pulling full up elevator to get traction on the tail wheel that when I dug out my old trainer a couple months ago, I ran off the runway the first three times I landed. You can't steer a tri gear plane with full up elevator. Old habits I guess.
Don