If a boost were included in some far off revision:
1. do you care what style of boost?
The idea of a slightly sparkly/gritty boost that can be used independent of the current MBD circuit would be glorious. (A la the new W&C super russian.) I like the idea of using that as my cleanish/gritty tone, and knocking the always on OD off my board.
2. along with a boost gain control, would you need a separate volume control when boosted?
Preferably.
3. how do you use the boost (ie. set the MBD for low gain and then boost for distortion or set the MBD for high gain and then boost for insanity?)
Low Gain > Boost for Distortion. (Or boost always on and kick in the MBD circuit for dist/thunder.)
4. carrots?
Always.
5. and this one is most important. What are you using now to boost it? I do see lots of people stacking pedals so is a boost truly needed or just convenient?
In my case, things rotate. Mostly I dial in a slightly dirty "clean" tone using a light OD pedal. I've occasionally had a fuzz or distortion pedal after that, and then an MBD-1 late in the chain. This lets me dial in some distortion going Light OD > MBD when I want it. More importantly, it lets me thicken everything and beef up the low-end when I want it. I've got some fuzz pedals that benefit from the depth added by the MBD-1 after.
6. Would you still be bringing your other pedals too?
I would have other stuff on my board. Again, if the boost circuit could be used without the MBD circuit, I might be able to ditch my always-on OD. Of course that depends on what the boost circuit sounds like. Therein lies the challenge...
7. Do you use the internal boost trim? How do you set it?
Your factory settings.
8. Do you use a boost because the available gain is not enough?
No, it's just another option and way to stack up the gain.
9. Are you worried about noise with excessive gain?
Somewhat, but it comes with the territory and is hardly noticeable live.
And the big one:
10. What's more important? Smaller size or an integrated boost?
That's a tough call, but I would opt for smaller size. If I had the preference, I would take a shrunken MBD-1 and use my own OD/boost to stack. The dual MBD/Boost pedal might make the board more often if it could replace another OD/boost pedal. I'm working with a Metro20, so space is an issue. The length of the current pedal make's it tough to fit on smaller boards...