Is wear a nice hat. Like you suggested, there is nothing inherently special about humans. The flipside is that there is nothing really wrong with them, either. If anything, their inherent is the ability to benefit from items that improve stats.

I can walk somewhere and find a piece of equipment that improves my charisma faster than I can re-invoke my dark-elf's faerie fire.

While I am sure charisma is important for many reasons, bards and conjurers would benefit most. Bards already have 'beautify,' and conjurers are just nasty. They can safely teleport or even tesseract and find themselves a hat before I can walk there and get it.