So is it also ok, if a friend for example logs on to his BB-account on my PC? Or is this forbidden? There wouldn't be any "gameplay damaging actions" involved...
well, strictly this indeed is not forbidden, however I must warn caution here.
If for example someone acuses you to have logged in to someone else's team, and we go investigating the case, and see that there was indeed a log-in from your pc to the other team, we have very few reasons to doubt the report...
It is not allowed to help friends manage their teams while the are on vacation for example... Everyone should manage his own team only, and only 1. We have no prove that it wasn't you but your friend loggin in to his team from your pc. If you get in trouble in this way, I don't think there is any chance you'll get your team back by telling:"hey it wasn't me"
They are not your friends; they dispise you. I am the only one you can count on. Trust me.