Windchill Document Management - Naming/Number Best Practices

We use a lot of soft types for our documents.  The main reason is so that we can kick off approval workflows specific to those types of documents upon document creation.  We do then use specific numbering conventions for those soft types for the most part.  For example test reports start with TR and followed by a number.  For some of them I also create their own library to make setting up teams and ACLs easier.  Some documents we don't care what the number is or if it has their own soft types or not.  For those we just use the standard numbering system and default type.  We have 9 different soft types now that span different types of documents and even one just for a workflow for making a model shop request.  It was an easy way to get what we needed into an approval routing.  With document classification now in 11.2+, we will be looking at putting more documents in Windchill and using classification also.