Is there a clean way to read the config file during a custom rule (code analysis/Tfs check-in policy)?

Question

I'm thinking of trying the following ideas:

• System.IO
• Package.GetGlobalService(typeof(EnvDTE.DTE))
• public override Microsoft.FxCop.Sdk.ProblemCollection Check(Microsoft.FxCop.Sdk.Resource resource), while blocking on the thread that does Check(TypeNode type) until the resource reading completes.

Anyone know if any of these will be reliable? or have a better cleaner solution?