From reading the thread and talking to players, we are aware that players sitting out at tables is a problem, and we do take it very seriously.
First, if you have not read the rules on sitting out, I suggest doing so. They are rules 10 – 12 on this page:
http://www.pokerstars.com/poker/room/policies/ring/.
Starting this week, we will be increasing our focus on enforcing these rules in the limit games. It may take some time before the effects are felt, but we know from experience from the No-Limit games that once we reach all those who are regularly breaking the rules, we see gradual improvement.
We invite you to help us by contacting us on Skype when someone is breaking the rules. If you send us a mail on highstakes@ with your Skype name, we will add you to our contact list. Since most instances of players sitting out are legitimate, we do encourage you to give people a minute or two before making a report.