Demihuman Ability Adjustments

Inspired by my Alfar rules, here's a different way to handle demihuman ability score adjustments in "roll in order" rulesets:

• Dwarfs:  can swap any score with Constitution.
• Elves:  can swap any score with Dexterity.
• Gnomes:  have big noses.
• Hobbits, etc: can swap any score with Charisma.
• Half-orcs:  can swap any score with Strength.
• Humans: can swap any two scores.

Any swapping of scores must result in the ability listed become higher than initially (i.e, a Dwarf could not swap an Intelligence of 10 with a Constitution of 12).