Half elf uses any ability

[bert1000]

Here's some house rules I am considering:

Races

Half-elf:

• No Group Diplomacy
• Half-Elves get +1 to two of the following defenses: Fort, Reflex, Will
• For the Half-elf Dilettante power, a Half-elf can replace a physical attack ability with any other physical ability (for instance, Str with Con) or a mental attack ability with any other mental ability (for instance, Cha with Int). This only applies to the attack and not any damage or effects.

Eladrin:

• Replace Longsword proficiency with Rapier proficiency

Classes

Fighter:

• Get Athletics and 3 other trained skills at 1st level
• Add Perception to class skill list

Any potential imbalance? Problems?