Introducing houserules:
1. Rolling a nat 1 or a nat 20 on a d20 roll does not guarantee success or failure. When the roll is a skill check, caster level check, saving throw, or attack roll (or CMB), a nat 1 imposes a -10 penalty to the roll, while a nat 20 grants a +10 bonus to the roll. Other rolls are not unduly affected by rolling a 1 or a 20.
2. Taking 10/Taking 20 is not allowed, unless it is granted specifically by a class feature (for example, some of the bard's class features allow Knowledge skill take-10).
3. Group stealth, when more than one person is avoiding detection, the average of the entire group's stealth rolls is taken.
4. When multiple people make a skill check, the highest roll is always aided by the lower rolls, and the total result determines success.
5. When crafting magic items, all of the prerequisites must be met - one cannot increase the DC by 5 to ignore one, though one can ignore one through class features.
6. All characters gain Weapon Finesse as a bonus feat - that is, for finesseable weapons all characters may substitute their DEX modifier for their STR modifier when determining to-hit modifiers.