There's a lot of work if you're going to associate companies with episodes. Companies are more for franchise, movie, manga series, and anime series pages. If we have staff, we could associate more than one company to a franchise, anime, manga, and movie wiki page.
This would be a dream. Even renaming the publisher tag to animation studio would be a dream, as most people use the field for animation studio as well. Multiple connections is the most ideal though. Even for animation studios, it's very rare for one company to handle every aspect of animation. An example would be Another, which is by PA Works who are pretty well known but also had Production IG (who is major enough to where you wouldn't they'd be doing non-headline work) doing some lesser animation in episodes.