Senior admin is whoever is the first admin on. They have to give you permission to throw up map changes, otherwise they are free to cancel whatever votes you put up. This is a long-standing server rule; i.e. nothing new here. Don't shoot your team mates. It's really lame no matter the reason.

As for admin abuse, I'd agree that slapping during a knife fight is a no-no unless you know both players very well.

Is it huge? Nah. If it becomes a trend, then it's a big deal. Otherwise not so much.