Dilettante isn't actually as weak as people think.
Other than that I was thinking of making them either a Half-Elf or Half-Eladrin and giving them a free racial feat from either pools of both halves.
Dilettante - I figure it works like any other ability: you have to meet the level requirements. If the character decides to, they can swap their power out for a higher level power (that still meets the requirement of being an at-will), once they meet the requirements for that power, but that will also use up their "swap" for that level.
Other than that I was thinking of making them either a Half-Elf or Half-Eladrin and giving them a free racial feat from either pools of both halves.