Bulk editing tests and requests
If it is a composite project, you could save it back to a standard/normal monolithic (.xml) project (switching project type composite to false in project properties). Once back into a single file project, do your xml changes in a text/xml editor and verify that it works after your changes. Once satisfied, save back as a composite project.
I have used this technique often. As you identify patterns in the project, it gets easier to manipulate the project outside of ReadyAPI in your editor. Here is a fun task... Create a ReadyAPI project (really just a single groovy test step) that creates, reads, updates and writes ReadyAPI projects.