Please tell me where I said FCS does everything I want.
I think the issue there is no software that will do everything that every person wants. I know you commented on this issue, but not sure exactly what you want.
If it is do do basic things (simple menu and playback) so your clients can watch what you produce, it is pretty much there. If you need more than that, there are other options, such as Encore and the other options that mentioned. The entire Final Cut Studio is fairly inexpensive at this point and rather comprehensive. Is it lacking for some things? I am sure each of us have a wishlist.
You can submit a feature request to Apple, but bumping this thread or discussing the issue on the forum is not going to really change things. Perhaps they look, but generally asking for the feature is going to be the best way to go.
I have Encore and use it with material from other parts of Final Cut Studio (such as edited items, etc.) It will do basic blu-ray authoring to some degree for under $1,000. (Think it was $799 last I looked with Premiere) The options are out there. DoStudio is $3,000. Again if blu-ray is important to a business, there are options out there at a reasonable price and which can be implemented into workflows. Some smoother than others. If the workflow is not that smooth (meaning it costs time for things that are generating income and blowing deadlines) then it sounds like another tool is needed to ensure business continues. If the price of $799 or $3,000 is too much, then perhaps blu-ray is really not that critical to the business.
Even doing a few small jobs will pay for it, and the things you describe you do sound like you are way past just making DVDs for friends (meaning that is a compliment and you should probably focus on getting what you need now to meet client demands and keep income coming in) since DVD SP does not do what you need it to do. Sort of like if you are a carpenter and you need to drive nails into a 2 x 4. You can drive yourself nuts using the handle of a screwdriver and wondering why the company does not make a screwdriver with a handle to drive nails, or you can get the hammer and just get the job done.
I understand the situation and frustration that it is not what you need and has not been changed, but at some point the aggrevation and worry cuts into what you (any of us "you") need to get done.