The problem is that requiring you to have all items gathered by yourself in order to sign... requires you to have multiple gatherers and crafters leveled up in order to perform a function that everyone should be able to do. And some ingredients need crafts/gathering classes in the 40s or higher. It's just a giant punch in the nuts when you can spend time making something yourself and not even be able to put your name on it just because you don't have several other things leveled. Even low level crafters would appreciate getting a kick out of wearing their own "hand-made" items.

My guess is that it will just be an extra synth step we do after the item is created, similar to dyeing. Maybe they will bring back Rename Cards to sign items =)