You can modify a lot of parameters for behaviors, both in the editor and at runtime. C2 also has one of the most flexible eventing systems I've seen, negating the need for quite a bit of coding (ie, you can do a lot you would have with code anyways). The SDK would be for if you wanted to code more abilities.
C2 uses services like cocoon js to convert to native apps, so it'll be a little limited in that regard and will depend if those plugins support what you'd like to do. C2 has a lot of windows 8 support, but I'm not as familiar, so ill defer that question.