Include optional unsubscribe group field on regular mailings
When you create a mailing from search results, you are required to add an unsubscribe group. When you create a regular mailing and add groups to the recipients, you can't specify the unsubscribe group. Sometimes, it would be helpful to be able to specify an unsubscribe group that is different than the group the contact is a member of. For instance, if you send a mailing to a few groups based on your main mailing list, perhaps a set of smart group that are subsets of the main list, you may want contacts to unsubscribe from your main list instead of the smart group.
Proposal: Add an optional unsubscribe group to all mailings. If it is blank, unsubscribes work as they do now. If it is populated, all recipients are unsubscribed from the unsubscribe group (exactly as this works for a mailing based on a search now). EDIT: On @JoeMurray's suggestion, contacts would be unsubscribed from both the original group that are recipients of the mailing and the specified unsubscribe group.
I can give this a go if there is support for the concept.