You can modify the CommandLineHooks.xml to do nothing in the commit. This will just save the files to your working folder. You'll need to add them to the changelist and commit using your own tool.
You can also use the new link to "Working Folder" option. This option just scripts out the files and saves them to this folder from the commit tab. In SQL Source Control, the button on the commit tab is actually changed to say "Save." You would then use your own version control system's tool to add the files to the pending changelist and commit them.
Strange that the powershell is not exiting.
SQL Source Control Product Manager