You need to add the ability to filter the contacts that aren't on any list to make it easier to manage contacts that subscribe by using the Subscribe button. I don't like having to find them individually each time to assign them to an email list.
Can't believe you really don't have this ability. Tech support told me that I have to export and then sort in Excel then re-import. That really takes some time for a simple operation. You guys can (and should) do better.