I think it depends on the situation Alf, and the game being played.
There are two trains of thought on how to ref say, U10s. One is that you call the travel, citing the fact that if you never call it, the kids will never learn it's wrong. The other is that you let it go, as to not frustrate the children by stopping them every time they do something incorrect.
Personally, I would lean a little closer to the latter, but in some situations leniency may be the best way to deal with it.
Considering we're talking about Nathan Wieland here (don't forget that Alf) naturally the games he's refereeing are a little different to U10s.
If the travel effects the game (IE - the player gains an advantage by travelling) then of course you're going to call it. If someone talk an extra half-step in the back court under no pressure, then no, I'd say it wouldn't be called.
I get the feeling your post was not soley directed at the travelling violation. But, since that's what you mentioned, I figured I'd focus on that. Apply similar logic to most rules, and I think you'll find a happy balance.
With regards to the flopping thing : the rule is there, the refs have to enforce it. Regardless of whether you like the rule or not, it's there, and the refs are there to enforce it. I'd suggest that if they do enforce it, we will see it out of the game rather quickly.