Last week we had to upgrade an application that's globally deployed which caused quite some hassle.
We had to go into the portal, change the GUID from several connected modules in order
to test out the deployments first.
After succesfull tests we had to then remove the test deployments and revert again the GUID's so PMPC could update the deployed apps/updates.
As you understand this is quite a process where mistakes can happen.
Would be great if we could create test deployments straight from the PMPC.