I'm afraid that DVD SP is not going to be able to help you with Blu-Ray. It never supported that format; in HD it only supported HD DVD, which lost the format wars to Blu Ray.
Most people who want to author a complex Bllu-Ray use either Toast or Encore. Or they send it out.
Compressor can do the Blu Ray encoding, but you'll have to use another app to author and burn.
As for adding surround sound, what I know is what I read. I've done a test or two just so I would know a bit about the concept, but I don't have the proper monitoring equipment, so I don't work with it.
Here is a thread that discusses the 5.1 workflow using legacy FCP and Compressor. It may give you some further insight and ideas.
If you're asking whether you can export a menu out of DVD Studio Pro to use with Toast Blu Ray, I'm pretty certain the answer is no.
You can build menus in Toast. And while they may not be at the level of DVD SP, they should be functional for most cases.
Compressor has a very basic (single track) BD option. You could try it with a re-writable disk to see whether it is acceptable for your purposes (the video quality is generally considered very good).
You could also explore Adobe Creative Cloud, which has a month-to-month subscription option. I don't believe their free trial includes Encore, but other than very expensive solutions, that may be your best bet.