4th Edition really shines in the math and balancing area.
Pathfinder shines in retaining the previous edition's powers.
Combine them.
Specifically
Use Pathfinder's Beginner Box instructions for generating a character but add 4th edition's starting hit points method and give low level characters encounter and daily powers.
Definitely use 4th edition's Fortitude, Reflex and Will Defenses but also use Pathfinder's Defense Saves for things such as ongoing damage, or for things where the character isn't attacked by someone.
Discard all the random and redundant power designing and narrow down Pathfinder's spell list and feat list removing the redundancy. Organize all the powers by what they do and how hard they are to learn compared to each other. For example, getting proficient with one weapon is easier than disarming a weapon. Casting a light spell for illumination should be easier than casting a fire ball. Removing poison should be easier than restoring an arm or raising the dead, etc..
Keep the range rules and burst rules similar for all powers. Keep the damage and level-up properties similar. It will make designing video games easier.
Pathfinder shines in retaining the previous edition's powers.
Combine them.
Specifically
Use Pathfinder's Beginner Box instructions for generating a character but add 4th edition's starting hit points method and give low level characters encounter and daily powers.
Definitely use 4th edition's Fortitude, Reflex and Will Defenses but also use Pathfinder's Defense Saves for things such as ongoing damage, or for things where the character isn't attacked by someone.
Discard all the random and redundant power designing and narrow down Pathfinder's spell list and feat list removing the redundancy. Organize all the powers by what they do and how hard they are to learn compared to each other. For example, getting proficient with one weapon is easier than disarming a weapon. Casting a light spell for illumination should be easier than casting a fire ball. Removing poison should be easier than restoring an arm or raising the dead, etc..
Keep the range rules and burst rules similar for all powers. Keep the damage and level-up properties similar. It will make designing video games easier.