I searched the documentation but didn't find anything and wanted to be sure. I didn't want us having to wait a few days for another submission to go through when we just want to make a couple of edits.
UPDATE: Just took a shot at it and you can edit aggregations, actions and objects without getting a new approval.
Confirmation: You can edit aggregations, actions and objects without getting a new approval. Tested it and wasn't required to approve again.