For the most part my pbf is going to be standard. 28 point buy, wealth by level, character's starting at lvl 4.
Odd-Even Hit Points
Many pbfs use half hit points. Personally I find that the lower the player's hit points, the more chance of someone just randomly dying from a critical hit. Also I don't think its quite fair, so I am going with average hit points, by means of odd levels giving half +1 hit points and even levels giving half hit points. IE. A 3rd level wizard gets 4 hp 1st level, 2hp at 2nd, 3hp at 3rd.
Last Gasp of Breath
I don't like killing characters, I don't really like people having to make new characters, and I don't like people thinking they can ressurect any time they reach a bad end. With all this in mind, things are going to be harsh to those who don't protect themselves. To balance that out, characters don't die until 1 full round after reaching -10, giving plenty of time for their allies to provide magical healing to prevent the character's death. Any character who reaches -10 is fatigued until they have time to rest and recover from the trauma they experienced.