This could potentially be a long post, I have lots of notes, but I will whittle it down as much as possible
Let me start here:
Nephilim wrote:well one issue here for me is this: what sort of tools for detection does CC have? in the quest to formulate the proper rule, it is essential to know if a proposal could be effectively enforced. say CC went w/ twill's original proposal.....how easy would it be for CC to enforce it?
And laugh. nice try, but we're not giving out trade secrets. Just assume that we can see through your computer screen and know who is sitting there

Now. I literally have 2 pages of hand written notes:
Gozar and
Detlef - time limits and % turns simply run into similar problems we have now and don't allow flexibility for people who are in speed games, real time games or just play frequently. We force the pace to a much slower 12 hour.
RiskTycoon - The problem is that you end up with people who legitimately need/want sitters being forced to play people who abuse sitters. If they don't accept that they are getting screwed over, they can't have someone sit for them.
Thezz - Lets say Abuse is the unfair gaining of advantage in a game. Now that unfair is what is open to perception and no matter how tightly we define it, someone will always define it differently than you or I and that is where the problems come in.
DiM - People are lazy, they don't read and they don't like doing work, thus they wont do it. It's simple statistics, not about mentally challenged players vs. geniuses. We are not here to teach, we are here for pleasure and as such, we cater to everyone from 6 year olds to 60 year olds (and 60 year olds who act like 6 year olds). For that reason and that reason alone your system will not work no matter how much we will it to or want it to.
Jim - that is a very well formed idea and after I got your PM I had some time to think about it: Limiting to 1 sitter is dangerous - what happens if your 1 sitter has to leave as well unexpectedly. Can you change sitters? if so, how often? If you can change, it leaves it open to abuse again - Right now I'm istting for A, 5 minutes from now, I'm sitting for B and in 10 minutes C is sitting for me...but only one at a time!
With the agreement to sit, there are too many chances for people to "forget to reply" or "miss your message" and force you to miss a turn.
With the open-ness of your rule(s), there is little onus on the teams to post their intentions at the start of the game meaning that people will "forget" and then complain later.
Now,
RoadWarrior has, perhaps hit the nail on the head with a very very elegant solution.
As such, I am going to propose what I think is a combination of our original proposal, Jim and roadwarrior's suggestions and covers most all bases:
Rule #1: No multiple accounts
Multiple accounts are discovered by routine scans and community cheating reports. They are strictly forbidden whether or not they play in the same games. If you suspect certain accounts belong to the same person, please report it following the instructions at the top of the Cheating & Abuse Reports forum.
We do allow members to occasionally "babysit" for other members that are away from the game. While any player on the site may babysit for any other, unless all players in the game agree, a player may never control more than one account in the same game (even if they are teammates) and, regardless of agreement, may not start or join new games (with the exception of ongoing tournaments) on behalf of the account they are sitting. It is common courtesy to announce in game chat that another player will take your turn(s) during your absence.
This may undergo some wording refinement to make it shorter, but does that address both the potential for
a) cheating, abuse and percieved abuse (the onus is on teams at the start of a match to declare intent. If one player dissents then you must find a non-team mate sitter)
b) allowing for teams who trust each other (i.e. have a good reputation for not abusing the system) to have team mates sit for each other in case of emergency.
I assume if you agree to have team mates sit, you're not going to perceive abuse down the line...
Now. The BIG downside of this is that there is a lot of social pressure being put on that one dissenter to agree - it's hard to say "no" when everyone else is saying yes.
I don't know how much of a problem that would be, but it's there.
So, thoughts?