WITHOUT using a 3rd party client, which I'm sure as all get out that they'll start banning random people because they just used some third party program for the item set editor, but it had some other function they didn't think about and Riot will just drop the ban hammer.
You can't. They havent built that yet. Remember the petitions all over the boards to bring back item sets?
That was because everyone was freaking out because it wasnt in the new, incomplete, client.
Note: I've already tried just watching what changes in the json files in the Config folder and I can't determine a pattern... sometimes it downloads all new ones where it is a subset of my itemsets... sometimes it leaves all of my itemsets in the file.
