Add them as keywords instead. Especially the anime ones: ecchi slice of life, seinen. Other anime-related keywords you can add "short episodes" (generally shorter than 10 minutes), shounen, shounen-ai, shoujo, shoujo-ai etc if those apply. don't add a keyword "ova" though, use the world-wide equivalent "direct to video".

At least, the ones not already at movies wont be added. For now add the other ones as keywords too.