I might suspect that you have not had a response, for this is outlined in the admin guide on page 16.
There is the ability to modify the log location, for the PSADT and MSI logs
From PSAppDeploymentToolkitAdminGuide.docx page 16
The default log directory for the toolkit and MSI log files can be specified in the XML configuration file. The default directory is C:\Windows\Logs\Software
This is the xml file AppDeployToolkitConfig.xml. I am seeing line 18 is where to change this for PSADT and below for the MSI logs.