I am going to be starting a new pathfinder campaign this summer and am currently planning on doing an E6 style campaign with a few other house rules which I figured I would share here to get some feedback. The campaign will be somewhat sandbox style with the players helping to establish a new kingdom. Players will know about all the house rules before the campaign starts.
In addition to E6 I am using several other house rules including the following.
-Every class gets +2 skill points but at least 1 skill point must go into a profession or craft skill.
-classes with martial weapon proficiency instead are only proficient with the martial weapons from a single fighter weapon group. The martial weapon proficiency feat will grant proficiency with an additional fighter weapon group.
-arcane casters can only know spells from a single school of magic. Once they can cast 3rd level spells they may cast 1st level spells from a second school.
-I am still trying to figure out exactly what to do for divine casters but I am thinking of limiting clerics to only the spells from all the domains belonging to their god. Druids will have a table similar to the sorcerer spells known table. Other divine spellcasters will have similar thematic limitations to their spell choices.
-all paizo base classes except summoner and gunslinger are allowed
I am trying to go for a campaign where characters are more focused with what their main abilities are and where combat isn't always the go to solution because if they fight everyone the fledgling kingdom they are helping to build probably won't last long.