The Dual Heritage feature of half-elves allows them to take feats that have either elf or human as a prerequisite.
As of this writing, there are forty-seven feats in the Compendium that have either elf or human as a prerequisite (not including two that also have revenant as a prerequisite).
Of those forty-seven, eleven are not effective for half-elves because they are elf feats that utilize either Elven Accuracy or Group Awareness.
Of the thirty-six elf or human feats that are effective for half-elves, eleven are elf feats and twenty-five (more than twice as many) are human feats.
I humbly suggest that someone design feat that allows half-elves to use Elven Accuracy, perhaps once per day, or as an alternative to their Dilettante power (perhaps in addition to some other elf-like benefit). This