Ever wanted to raise a specific skill, but just couldn't find the correct recipe to do it? That's where this button would come in - it will allow searching for the skill used in crafting an item, this would exclude skill used when improving of course (which is usually the same, except for few exceptions). Practical problems as example #1: looking up "Pottery" as category will return 4 items, but not the most difficult one called Clay/Pottery Smelting Pot. #2: All items of Jewelry Smithing show up when searching for "Jewelry" just Ball and Bowl don't (the most important for grinding this skill). #3: when looking up "Masonry" it returns ~ absolutely nothing. Also found here: https://wurmonline.uservoice.com/forums/12046-wurmonline/suggestions/6638992--search-skill-button-function-for-crafting-reci ^ if you want to vote on it.