HOW TO NOT GET BANNED:
I've been playing for about 7 days now, and what's been working for me is NOT using the mod on the Guild and Global bosses (I completely kill the mod and then attack them - obviously without turning on any multipliers, just to be sure...
If you've succeeded in using the mod on the bosses without getting banned please do tell. But honestly I don't think it's worth using the multipliers om them, their resources isn't that important, and doing 100x the damage your supposed to could get you reported by your guildmates... I find it more fun to just get stronger by going all out in the dungeons, and the stages - you dont need anything else to get very far)
ALSO I've NOT joined the rankings, which means to not bind my account. Someone said that this makes them the game notice your unaturligt progress, and gets you banned. Although I'm honestly not certain. I haven't tested it much. Someone else might have som details. But Yeah thats what's been working for me.
Have fun!