Allow Users to Pick Their Preferred Cover Art
Simple as. While they should adhere to guidelines, users should be able to opt for which box art they prefer on IGDB. Doing so would not only be preferable for some who prefer some art over another, but would also fleshen out the Database by letting users see which artwork corresponds to which region.
If allowing users to pick cover art isn't feasible, the site should just host multiple cover arts instead of just the one.
This feature could also help future sites dependant on the API and are also based on JP/EU/others info, some of which is already available on igdb for fields like release dates (for example).