I think the easiest way to do it would be to add your accounts and set their weights accordingly, and set the required weight to a low amount as well. Then in the CLI increase the required weight with a proposal.
For example if you wanted to have a 3 of 4 scheme you could add all 4 keys and give them each a weight of 30. On the same transaction you should be able to set the required weight down to 30 as well. This will allow you to set up the keys in the gui. Once you have this done, then you will just need to set up a proposal in the CLI to increase the required weight to 90 and have 3 of 4 approve that transaction.
I just thought of a question. Are proposed transactions how recurring payments will work? Just create a bunch of proposals with future dates, and approve them. They will auto transfer when the date comes.