AQtime8 Set the global or project specific source file search directories via COM automation?

I'm writing a little tool to integrate AQtime8 with our build server that uses C# to automate AQtime8 via the COM interface(s). I'm doing so because the existing command line parameters don't give us enough fine grained control of the features, and we don't want to setup .aqt project files for each of our unit tests.

I'm pretty sure that there's a COM interface available to set the source file search paths for a current project, unfortunately it's just not one I could find in the documented subset.

Would be great if anyone could tell me which interface and functions/properties to use.