Mustrum_Ridcully
Legend
I just wanted to chime in and say that I am pretty intrigued by this concept. I have no idea if I will ever run a E6 game, but it sounds interesting.
Some Notes about skills:
I would recommend against increasing the attainable rank to high - Otherwise, you might up getting the same effect as leveling certain characters. (But I think it should be possible to expand a characters skills further)
An alternate suggestion would be to just lower the skill requisites, or add some feats that increases your skill ranks for the purposes of qualifying for feats.
Further skill improvement should (in my opinion at least) not increase _what_ the characters can achieve, but how easy it is for them get a possible result.
Examples might be (stealing from Star Wars Saga Edition):
Improved Skill Focus
Prerequisite: Skill Focus in the skill in question:
Take any one skill you have the skill focus feat in. Your effective rank is considered 2 points higher for determining if you qualify for a feat. In addition, you may decide to reroll any check made with the skill. You must take the reroll result, even if it is worse.
Greater Skill Focus
Prerequisite: Improved Skill Focus in the skill in question
Take any one skill you have the Improved Skill Focus feat in. Your effective rank is considered 2 points higher for determining if you qualify for a feat (this benefit stacks with Improved Skill Focus). In addition, you may always choose to reroll the skill and take the higher result.
Improved Skill Mastery
Prerequisite: Skill Mastery
Choose a number of skills equal to 3 + your Int Modifier in which you have the Skill Mastery for.You may now take 15 on the skill, which works identically as taking 10, except that your result is 5 points higher.
Greater Skill Mastery
Prerequisite: Improved Skill Mastery
Choose a number of skills equal to 3 + your Int Modifier in which you have the Skill Mastery feat. When taking 20, you require only half the usual time.
Or mix and combine the benefits of these feats like you prefer.
I would also recommend using the PHB II retraining rules a lot more - these make a lot of sense now. Characters now can change their focus, and losing skills, ability points, feats or even class levels for alternate ones basically emulates "skill degredation". If you begin to focus on something else, your other abilities fade...
(I would put some limit on class retraining: I think the first character level should be "set in stone", so that nobody ever forgets how he began...)
Some Notes about skills:
I would recommend against increasing the attainable rank to high - Otherwise, you might up getting the same effect as leveling certain characters. (But I think it should be possible to expand a characters skills further)
An alternate suggestion would be to just lower the skill requisites, or add some feats that increases your skill ranks for the purposes of qualifying for feats.
Further skill improvement should (in my opinion at least) not increase _what_ the characters can achieve, but how easy it is for them get a possible result.
Examples might be (stealing from Star Wars Saga Edition):
Improved Skill Focus
Prerequisite: Skill Focus in the skill in question:
Take any one skill you have the skill focus feat in. Your effective rank is considered 2 points higher for determining if you qualify for a feat. In addition, you may decide to reroll any check made with the skill. You must take the reroll result, even if it is worse.
Greater Skill Focus
Prerequisite: Improved Skill Focus in the skill in question
Take any one skill you have the Improved Skill Focus feat in. Your effective rank is considered 2 points higher for determining if you qualify for a feat (this benefit stacks with Improved Skill Focus). In addition, you may always choose to reroll the skill and take the higher result.
Improved Skill Mastery
Prerequisite: Skill Mastery
Choose a number of skills equal to 3 + your Int Modifier in which you have the Skill Mastery for.You may now take 15 on the skill, which works identically as taking 10, except that your result is 5 points higher.
Greater Skill Mastery
Prerequisite: Improved Skill Mastery
Choose a number of skills equal to 3 + your Int Modifier in which you have the Skill Mastery feat. When taking 20, you require only half the usual time.
Or mix and combine the benefits of these feats like you prefer.

I would also recommend using the PHB II retraining rules a lot more - these make a lot of sense now. Characters now can change their focus, and losing skills, ability points, feats or even class levels for alternate ones basically emulates "skill degredation". If you begin to focus on something else, your other abilities fade...
(I would put some limit on class retraining: I think the first character level should be "set in stone", so that nobody ever forgets how he began...)