I've noticed a trivial issue. I am currently running Geant4-11-00-beta-01. In the function G4MTRunManager::CreateAndStartWorkers() I don't believe there is any way to suppress the message "--> G4MTRunManager::CreateAndStartWorkers() --> Initializing workers...". This function begins on line 329 of G4MTRunManager.cc.
Thank you for spotting this. We will add a verbosity check in the next patch release.
Thank you once again for reporting this issue. The fix will be included in the coming patch release.