When using a project in multiple suite mode, moving/copying test cases is possible via drag/drop. You can drag/drop (copy/move/paste) between suites because you can see multiple suites in a single view.
However, when using the new baseline approach you can no longer copy/move/paste between suites as you can only view one suite on a page at a time. I can understand that with baseline support some customers may want to restrict moving/copying between baselines but there are use cases for it.
The strategy we are using with baselining is to create test cases for new features in our Master, baseline Master after release, then delete all feature test cases from Master not deemed to be regression. It will hopefully be very rare but there may be situations in which we determine that an old test case from a baseline should now be promoted to regression (back to Master). At the moment we are assuming that this would be so rare that we would just re-create the test. Being able to copy from the baseline would be useful.
Another use case would be for being able to copy/move/paste between projects. This would enable us to use a separate project as a sandpit for agreeing on test cases before they are moved into Master on our main project.
I would hope that this could be implemented as a select dialogue launched from a Copy/Move button next to the Add Case button. The dialogue would allow me to select test cases from other suites or projects then provide me with two buttons - Copy and Move.