We typically target our Test Plans for a beta or final release so we always add all of the Test Suites once. It would be nice if the Add Test Suite mechanism provided an easy way to select multiple suites from the project and add them with one click. I’d even settle for an extra item in the current list titled “All” that would do exactly that.
Thanks for your posting and feedback. Yes, it is already planned to look into this. We usually recommend having just a few test suites per project but also want to make sure that the test plan form works really well with many test suites as well and we would like to look into this for one of the versions after the next one (which focuses on reporting instead).
Thanks again and please let me know in case you have any further questions or feedback.