We've discussed that a bit previously and the conclusion was to limit the featured checkbox to filtering out doujins unless we can work out precisely what "directly" worked on means.
Take for example, a vocal song:
Release on theme song single -> official soundtrack (short version) -> vocal album (different vocalist) -> official arrange album -> "best of compilation" -> official soundtrack of sequel (instrumental) -> doujin arrange -> doujin remix -> remastered original soundtrack 2 decades later
Technically the song composer's direct involvement would stop right after the release of the theme song single, no? Yet no discography would put at least the next 2 albums under a "featured on" section.
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