Alright. I hate to say it, but unless you're either quite experienced at hacking exes, or prepared to do a lot of learning and trial and error including changing other exes for learning experience, I'd seriously suggest against it. It is just so complicated when looking at changing a program of the complexity of CK and so much can go wrong that a beginner trying to meddle with it is asking for trouble. I was an analyst/programmer for 13 years and I wouldn't like to try it myself without quite a bit of pre-reading and knowledge of how programs are compiled and how to find what you're looking for.
And when an error pops up? It could be anything. We don't know what you've changed, we don't know what it was originally supposed to do, so how can we tell what a windows exception report is telling us?
You're also asking for advice as to how to alter a program (I assume, you're talking about hex editing exes) that is programmed by the owners and distributed and supported from this site. Which I am pretty sure would be against the user agreement for the program.
So, that in short (and I am not trying to be mean here, just realistic). Forget about it.