I think it might be useful for more than me to be able to filter tasks on them being mentioned in a document. This goes specifically for requirements that we typically have as requirements in a list, but also part of a document explaining more thoroughly the behavior we want. To figure out if all requirements are also mentioned in a document it would be nice to filter on tasks not having linked docs to it.

Right now I use a workaround, and that it to list all tasks(requirements) and its linked docs.