Not much, right now. If you have an idea and some code, just create a PR, I will gladly review and comment (and, likely, merge)
Just one minor note: bumblebee-status is mostly a one-person, spare-time project, so please be patient when answering an issue, question or PR takes a while.
Also, the (small) community that has gathered around bumblebee-status is extremely friendly and helpful, so don't hesitate to create issues with questions, somebody will always come up with a useful answer.
:)