if you are planning to block for quality without activating the Quality management then in my opinion the process which you are following is okey
1) As an workaround you can create a new dummy storage type, Don't define this dummy storage type in search strategy. Till the time you are not getting the confirmation from QA department for dump / release let it be in that storage type once you get the confirmation you can move to actual storage type / storage bin
Con of this approach is you have to do multiple handling one from production to Dummy storage type and upon confirmation from QA, from dummy to actual bin location location
2) Please have a look on the below existing SCN thread shared by SCN member and sap standard link to get more detail idea
IM/WM/QM /PP INTEGRATION PROCESS
WM-QM Interface - ERP SCM - SCN Wiki
WM Interface to Quality Management - Warehouse Management Guide - SAP Library