Partial quote: That certainly helps 1) a player not getting stuck with a first set of unlucky roles
It does and it doesn't.
2D6 is a wide enough range to provide a lot of variation in between characters.
For example, I'll roll up five quick lines of stats, using real dice:
1 - 5B6A8A
2 - 497552
3 - 677A77
4 - 752867
5 - 767487
Now, obviously, the first line of stats I rolled is the "best", unless you're dead set on having higher STR (which can be brought up during chargen if rolled).
The player looks at these stats and decides to use Set 1. Now, I rolled all these numbers by hand and didn't doctor any of them. I'm glad it turned out this way, though, but it really shows my point.
The player using Set 1 will be very careful of any Survival throw he has to make because he wants to use those high stats. He knows, if he bricks a Survival throw, that he'll be using one of the other sets.
Therefore, this will guide him not only in the type of career he takes (a healthy respect for Scouts appears in the player), but also in how many terms the character goes--each term giving him another chance to kill that good character and go with the lower stats.
It's a pretty good system, I think, bringing balance to the game. The player has a higher chance to get better stats because he's throwing five different sets, picking one.
But, the player can also roll bad and brick the 1st Term Survival throw.
It all balances out.
And makes CT the game its supposed to be.
I sure like this...SO MUCH MORE...than I like what Mongoose allows, arranging stats to taste. That's moronic, imo. Chances are, everybody's SOC is their lowest score, except for the player who wanted to play a noble.
To the OP, I believe there is no place that specifically states that the rules have to be used, as written, with no variation.
I dunno about MGT, but CT does address this in a couple of places. CT actually expects the GM to alter rules to his tastes. There's a section in Book 0 that guides the GM in making house rules.