We've done pretty well with the Boost Stick for the 04-05 LLY, and feel it really does serve a specific purpose. To fix tunes. The problem is that there are so many combinations out there and it doesn't work for all of them. At this point we don't plan to release one for the LBZ, but you never know. It's a lot of work to support these things.
One thing I've been preaching all along though is that boost can be done in any tuner and can be done so much better/smarter than with a fooler. Only Diablo ever made an effort to add boost to their LLY tuner. For the LBZ all off the shelf tuners (including Diablo) seem to have ignored the tuning of the turbo once again. I guess they were just in a hurry to get product on the market.
EGR, boost, etc can be taken care of by smart tuning. When I write a tune the only "crutch" it really needs is a good lift supply.