You don't actually have to "slam" your studs into a player for it to be deemed dangerous play. Dangerous play can be punished for intent, and also where contact was nearly made. We often see people recoil from a flying foot heading towards their face, and it is punished.
As overhead kicks don't often scream in from 35 yards, you can assume that anyone attempting one will be in or around the penalty area and in the majority of cases will have an opposition player directly behind him with a head about the same height as the attackers foot is just about to be. This IS dangerous play. Football may soon lose some of it's classic goals if we continue down this route.