+1
After toying around with this, can't say honestly that I like it all that much- tends to give a more "sterile" and flattened tone at a variety of settings. But, if you're going to use it, should not have it on the global output side of things.
Just my 2 cents..
Well, if you don't like it, just don't use it. 
You don't have to. Nevertheless, if they can make it available on a per rig basis that would not be bad. However, after trying it, to me it sounded (first impression) better or just the same (on clean rigs) thus I should be fine being able to turn it on or off globally.
Fractal's version is per preset but I think I see why Kemper version is global. Fractal version slows down preset change a bit and control is laggy. Must be lots of math behind the scenes so making it per preset would probably slow Kemper way down because it has slower DSP.
+1 for a per preset implementation.
+1 I'd love it to be per rig if possible
Per-Output would be my preference, but +1 anyway.
IMO per output makes more sense. This is something similar to Di/merged rigs. I'd like to have it on my monitor, but not on PA or recording output.
Well I play multiple styles of music and may want it activated for certain styles and not others so per profile is my vote. If we could have the option to disable on monitor out also that would be great.
Same here Deadpan we play a huge variety of music, maybe we'll need to bring 2 or 3 Kempers to shows, lol.
I agree 100%!
+1 to making it a rig-changeable parameter.
Surely this will be done; it just makes sense.
Correct me if I'm wrong, but is't Space also possible to use as an effect block in addition of using it as a global setting? Based on this I could imagine that Pure Cab could be placed also in the effect chain in the future?
CK said it was planned
I think "Space" is confined to where it is, mate.
That said, there's no obvious reason why it couldn't be included in the reverb menu as well; it's essentially an early-reflection algorithm / convolution impulse, after all.
As for Pure Cab, well, you want that acting on / inside the cab output (in the processing chain), and nowhere else, IMHO. It's the phase-cancellation characteristics of the cab / mic combination that it works on; it's simply not designed for any other purpose, and would surely produce unpredictable and most likely unmusical results when applied further down the chain.
Aside from this speculation, my guess is probably no better than yours...
