How do you instruct NUnit to load an assembly's dll.config file from a specific directory?

If an assembly contains an app.config file, ConfigurationManager will load it as long as it is in the same directory as the NUnit project that is executing through NUnit-Gui. To illustrate consider the following folder structure.

+ TestFolder
    testProject.nunit
  + AssemblyAFolder
      assemblyA.dll
      assemblyA.dll.config
  + AssemblyBFolder
      assemblyB.dll
      assemblyB.dll.config

Both AssemblyA and AssemblyB exercise code that calls into ConfigurationManager. If I run these test assemblies independently in NUnit-Gui, ConfigurationManager will correctly resolve the local configuration files.

However, if I load testProject.nunit into NUnit-Gui (which contains references to both AssemblyA and AssemblyB), ConfigurationManager looks for the configuration file in TestFolder regardless of which assembly is currently executing.

Is there a way to direct NUnit to reload the application configuration to the one present in the current assembly's directory?

Here are the contents of testProject.nunit:

<NUnitProject>
  <Settings activeconfig="Debug" />
  <Config name="Debug" binpathtype="Auto">
    <assembly path="AssemblyAFolder\assemblyA.dll" />
    <assembly path="AssemblyBFolder\assemblyB.dll" />
  </Config>
</NUnitProject>