Hey Andrei! To copy followers from a single account, yes, you’ll have to delete your current list of Competitors/Similar accounts and add the account you want to Copy Followers from. A list of their followers will be generated and displayed to you.
You’ll find the Non Followers option and the other features you’re looking for in the bottom left corner of your screen, under “Twitter Growth Features.”
As for the Smartfeed mentions that I think you’re referring to, this shows up in your prescriptions as tweets that you should retweet or like. The Smartfeed suggestions are based off of Twitter accounts you have previously retweeted.
Do write to us at firstname.lastname@example.org if you want any more information or if you need any help at all! Best - Ann