Here's an idea that could work in my opinion:
First of all, we have to decide who the top managers are and we must look at some numbers (I did a quick research, there may be errors; these are the players who managed more than 1 tournament last year):
-sdtoot: 14 (2 GS, 3 MS and the WTF);
-hallso: 8 (1 GS, 2 MS);
-jrm: 8 (0 GS, 0 MS);
--Evita-: 7 (1 GS, 1 MS);
-Caio_Brasil: 5 (0 GS, 0 MS);
-Boarder35m: 4 (0 GS, 0 MS);
-nkp2: 4 (0 GS, 0 MS);
-greatkingrat: 2 (0 GS, 1 MS);
-Aguante_El_Gato: 2 (0 GS, 1 MS);
-TankingTheSet: 2 (0 GS, 1 MS);
-Action Jackson: 2 (0 GS, 0 MS).
sdtoot, hallso and -Evita- are clearly the ones who are used to take the big tournaments, which are those with more than 60/70 players signed up. These are, without a doubt, top managers.
Then we have myself, jrm (didn't notice you managed 8 tournaments, thanks a lot!), Boarder35m and nkp2 with 4+ tournaments managed but all non-mandatory. Some of those were the only tournament of the week so it's not much different from managing a mandatory one. In my specific case I just took the tournaments that were probably going to be cancelled, in the last minute.
In my opinion the top managers would be sdtoot, hallso, -Evita-
and I would include jrm
here as well.
The defined top managers would be able to take 1 ATP 250/500 per month + any mandatory he/she wants. Otherwise, I really don't think we would have enough managers to all the tournaments. Just check 2009 managers thread and you'll see that there were many cases of players managing straight weeks.
Considering that the busiest month is February (12 tournaments, all non-mandatory), if each of the top managers took 1 tournament there would be 8 left for other players to take. The other months aren't that busy and tend to have 5-7 non-mandatory tournaments.
For those who are not top managers, there would be a limit of 2 non-mandatory per month + the mandatory ones.
In resume, that's the proposed idea:
> Top managers: sdtoot, hallso, -Evita- and jrm
> allowed to take any mandatory tournaments + 1 non-mandatory per month
> Other managers
> allowed to take any mandatory tournaments + 2 non-mandatory per month
* a manager can't take tournaments in straight weeks, being or not a top manager;
* if no manager takes a tournament until 1 day before the main draw is released, following the rules above, the tournament is cancelled, the players commited to this tournament are moved to the other(s) of the week (if there's any) and the circuit moves on.
If there's agreement from board members, other managers and any regular players who visit this thread we can start the year using these rules already. I would keep track of everything on this issue.