17. Can I let another player take a turn for me when I am away from the game?
You can, with the stipulation that the account babysitter is not your opponent in any current game. It is common courtesy to announce in game chat that another player will take your turn(s) during your absence. Babysitters should only do what is necessary to take the turn(s) and should not interact with the community, start or join new games (except for ongoing tournaments). Furthermore, you should only take another player's turn if they are in danger of missing a turn, not for the purpose of gaining a tactical advantage.
What's the limit of not interacting with the community?
Let's put an example:
You are in a tourney where you need to pm the TO every round, for x reason, like who you want to attack in that round. Now while being in that tournament I have to go and leave to the babysitter to play my games and... WOW the round finishes and the TO asks for the new attacks... could the babysitter send a pm sending the attack? Obviously the normal is that is forbiden, but cases like this is still considered a violation of the rules??