Gangplank "One Part"/"Ghost/Phantom Barrel"

I'm just curious about this mechanic on GP, since he's my main. I can do it just fine now that I've had practice (praise practice tool) but I have a few questions about it.

1). Does anyone know who invented this? I'm pretty sure it was a high elo GP main who discovered it by accident but does anyone know who?

2). What this an intended mechanic, or just one that was discovered and Riot ok'd it?

3). If Riot is okay with it, do you think they would make it easier to do in the future? (If a Riot member responded, that would be dope, but speculation is just as ok ^^)