There is no need for a disbute about this, but fact is:
I know what bowser said to me, and there was no need to implement it because I already used this effective methode even in my contest entry but with "custom scripts", not in JASS.
Now it's the same methode but written all in JASS.
Maybe it still can be bit improved for sure, like almost every code, but has nothing todo with bowser's suggestion.
I know it's not 100% smooth as it is in non-wc3 games with arrow keys, but thats also a problem of the engine itself, so I recommend to play it with a delay reducer tool, to keep it a minimum.