I'd assume it would go in the same place as a normal wah but I don't know for sure.
I was simply planning on using the boost pedal to make solos stand out a bit more rather than use a volume pedal.
As to the additional distortion device I was looking at, I'm really stuck on that one. I'm using the Bad Monkey to tighten up the distortion on my amp's drive channels and give it a little more gain but that won't take me far enough to get into modern high gain territory. I've written to a number of manufacturers explaining what I want and saying I won't be using the clean channel and they keep suggesting the most extremem pedals they have, like a Metal Muff for example. Surely that would be too much on top of an overdriven drive channel as I was anticipating having to use a second overdrive pedal to cascade the effect. Any advice?