IIRC, Edit in CAS is one of the "advanced" options under Master Controller. You do need to make sure your game is updated and that you have the latest version of the mod though - if Awesomemod is crashing your game, it's likely because you either have an outdated version, your game is outdated, or both. If you just aren't finding the option on MasterController, please refer to the information available at Twallan's site (where you got it from), as we don't provide support for specific items.
Twallan's MasterController isn't a core mod - but if you have -another- core mod (something different, like Extended Game Core or something like that) plus Awesomemod, that can cause issues.
Rather than Twallan having to look at it, it's probably going to be a lot easier for the OP to remove MasterController and Awesomemod, delete cache files, and test that way, make sure their game is updated, and download fresh copies of both mods and then put in one, test, and then the other, rather than having a mod creator poke at it when it's probably resolveable on the user's end.