Microsoft Security Compliance Manager includes the functionality of the GPOAccelerator. At this time there is no info on how to automate the installation but there are a few bread crumbs but not enough to create a working install. I will, however, share what I got.
(FYI I did this on Windows 2008R2 64bit)
-launch Microsoft_Security_Compliance_Manager.Setup.exe and wait for the first screen
-it will extract the root of any local drive other than C: if possible.
-Copy that folder and kill the installation
-In the copied folder you can find scmsetup.exe that reads setup.ini and creates a log file in SCMSetup.log
-Use the value of the proper SQLDownloadPathFromWeb property that matches your platform.
(e.g. for 64bit windows =http://go.microsoft.com/fwlink/?LinkID=129690) to download SQL Server 2008 Express
-place SQLEXPR_???_ENU.exe file in the same folder
-at the end of setup.ini add:
(All the property names used in the [setup] show up inSCMSetup.log)
Now the hard part is to figure out how to tell scmsetup.exe to run unattended. It seems to ignore /Quiet /Silent /Q /QN /Unattended, etc. I can launch it manually and see the PublisherName and other properties show up in SCMSetup.log as it asks for them in dialog boxes but that's it. Then I got fancy and tried to add comments to Setup.ini and from there on out, all my test caused scmsetup.exe to ignore my [Setup] section completely; even when I undid the changes.
In SCMSetup.log, it shows the command line it uses to install "SQL Server 2008 Express" unattended so you could in theory preinstall "SQL Server 2008 Express" and then try to install "Microsoft Security Compliance Manager" after.