What is the simplest way in TFS 2012 to classify a bug as something different than "bug", such as Enhancement or Change Request or Feature.
In mantis there is a category field that can be set, and its allowable values come from an modifiable list.
Can the same be done in TFS?
In visual studio 2017, when you open the bug, it opens to a web page. On that page on the right hand side there is a "..." (Action) button. This drops down to include a menu item that says "Change Type".
From this you can make the item a "task", "Epic", etc.
These titles may be different depending on if you are using an Agile template or some other template for the project.
This is using TFS online. I don't know if TFS 2012 has the same feature in the same place, but it might point you in the right direction.