I am going through this same requirement in my company now.
I could see that this is a very old post.
But I would like to contribute my approach for silent installation of QVS.
The version we will be running is 11 SR1.
So this may work for version 10. It may not.
I am using the below command.
"%systemroot%\System32\msiexec.exe" /i "<FileLocation>\QlikViewServerx64.msi" /qn /norestart /log "<LogFileLocation>\QlikView_Server_Install.log" AddLocal="DirectoryServiceConnector,ManagementService,QVS,WebServer,DistributionService,SupportTools" REGION_LIST="<Your Country>" AgreeToLicense="Yes" USERNAME="<Your User Name>" COMPANYNAME="<Your Company Name>" LOCALSERVICE="True"
This installs the QVS under the local system account.
We can then modify the services manually to run under a service account.
I did not automate this as I do not want the password to be available in plain text.
Also it can change at a later date.
We should also add the service account to the QlikView Administrators group.
This can be performed manually or using a script.
Kindly let me know if you have found a way to include login credentials as part of silent installation.