One of the main strengths of TFS is that work item tracking and source control are closely related. Another of its main advantages is integration with the Visual Studio IDE. It looks like you are not using any of these features, so you will distract you from using TFS as a solution.
Another factor that is unknown here is how much you will need to pay for TFS licensing. If you already have something that applies to existing MSDN licenses, then this is probably not a factor.
Allegedly, the flexible process template in TFS 2010 is a very nice solution for flexible applications, providing you with the work items and management reports you need to work in a flexible environment. In addition, you can modify the process template as needed to suit your particular flexible taste.
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