Save workflow wid on field instance instead of base

I use the the submodule workflow field to set states on my entities. I would like to use the same field (same database table) for different workflows. This would enabled to easier list different node types with different workflows and show there states in views for example. This can be solved by saving the the wid (workflow id) on the field instance instead of the field base. I written a patch that makes my use case work but will probably break some of the other submodules. But it maybe a start...