Ap GP

Okay so I've been playing for quite some time, far before the Gangplank rework, and don't get me wrong I can appreciate what the rework did and how he has more identity. But I used to play ap gp before his rework and it was hysterical. It wasn't necessarily the most effective or anything but that wasn't why I did it. I enjoy doing stuff that made me have to work harder to win or that people normally won't do. I was just as disheartened with the mf changes since her e+ult are so much weaker on the ap scaling side and effectiveness now. Again I understand this from design standpoint and I've let her go. But ap gp is still funny if not almost entirely unusable. The issue is that the barrels don't apply magic on hit damage when they explode. So like lich bane or wits ends and things don't work on them. The tooltip in game itself doesn't say this and I wish they would change it or just put a little "(physical damage only)" next to it or something. But what gets me more is why it doesn't at all. I don't understand that part. It's a spellblade proc so by all accounts I feel it should work. I'd at least like the option to go ap gp for shiggles if nothing else. Opinions?