Adam_Vavrek1

Absolutely, you can create Tags in Admin and add them to the campaign from the Setup tab. Here's more on this.

Ah, I meant bulk-approve. Thanks Katie and Dory.

Have you thought about using a GIF? There's plenty of tools out there that can create what you're looking for. Try this one: http://www.timeanddate.com/countdown/create

I've been told that it can take up to 6-7 minutes to update bi-directionally.

I wouldn't bother removing them periodically. They won't get any emails going forward after they unsubscribe anyway.

Is the Campaign an engagement program? If so, you could set up a Smart Campaign to watch for when data value changes in that checkbox and "add to engagement program".

I created an Idea for this a couple of weeks ago: https://community.marketo.com/MarketoIdeaDetail?id=08750000000K8llAAC