Fanzines can generally be difficult to catalog, since many lack basic info such as authorship, year and place of production or contact address. Koha should probably do something in the sense of making zines more easily catalogued.
What do you suggest to make this easier? It's up to you how much information you catalog - none of the fields have to be mandatory - although I'd recommend to have 245$a :)
Koha supports cataloging books, DVDs, magazines, comic books, video games, laptops, tablets, bicycles, infrared thermometers, pocket digital projectors, and anything else you can think of. This sounds like a cataloging question rather than a question of Koha functionality.