"It's not botting, it's AFK training"

Using anything that is outside the game is definitely NO in my book.

"AFK training", if I understand correctly, relies on the way Windows communicates with out-of-focus windows. It only works because you alt-tab out of Maple. How can this possibly seem like a legitimate way to play Maple, when you must leave the game to accomplish it?

Holding the button down with your own hand is legit, in my book, although Nexon has no way of telling that apart from having a rock on the keyboard, so I wouldn't recommend it.

I'm not familiar with the chair+autoskill+HS setup. Anything that is entirely in the game could be legit, or could be glitch abuse. Use your own common sense, but don't be surprised if you get banned for something you "thought was intended." If it's too good to be true, it probably isn't true.

I don't think the auto HS skill thing is too big of an issue, I timed it and it only recasts 19 times rather than 100 for some reason, so you have to be paying attention to the game once every 90 minutes or so to keep it going which means it won't work overnight or while you're at school/work or whatever.