Would be awesome if there was a filter, perhaps a persistent checkbox located in the section where you choose the craft/level, which would only display recipes where the main craft was the highest required craft skill.
Right now, for example, you can get listings in the Cooking skill where a recipe is:
Alchemy(72)
Cooking(15)
Adding a filter would prevent entries like this from being displayed. Wouldn't require any overhead on the server-side, just make the tables prevent items like that from being displayed client-side. I would seriously <3 this.