metadata and content types

Question

guys we are currently looking at setting up our content types and meta data in sp2010. There is alot of debate about how we should go about doing this. I was asked a question by a colleague who wanted to know if its a good idea to tag am item with a keyword the same as the content type. He asked if this would help users find the relevant documents when doing a search. As an example, say you have a scope document content type. Is it incorrect to add a managed meta data document type column to this which is fixed to the term "scope". It would certainly help with the refinement bar when searching but is this the correct way