Add user role-level permission for 'Import tweets'

So I have Drupal set up so that there is a global Twitter account that stories and major updates get tweeted to, and whose posts show in a sidebar block.

I currently have "add twitter accounts" permissions turned off for all non-administrator users because I do not want to import any tweets except for those by the global account to Drupal.

However, I would really like to use #478504: Global twitter account can follow all user added twitter accounts, also direct messages, so that users can add their Twitter account and the global Twitter account will automatically follow them. But I would like to do that without it allowing them to import their tweets.

Unless I am mistaken, I think this means we need a role-level permission for "import tweets" that's separate from "add twitter accounts".