#20 Unicode fallback

[Roze Doyanawa]

Hi, I have this beautiful English-character-font that I wish to use, however, I would like to have the OS fall back to another font if the glyph does not exist.
For example, if I view a text containing both japanese and latin characters, and my font cant handle those japanes ones, I want it to fall back to the default for that range, like how it works with SeogeUI in windows. How do I do this?