Okay, so you attach VS to the main exe, then use usual things, great!
Tried SEH years ago but I failed to enable it on whole project (unwinding problems or don't remember).
This looks good, will definitively follow your project.
You can use our system outside of RCC++ with only a small amount of effort - have a look at RuntimeProtector.h and the implementation functions in RuntimeObjectSystem_Platform*.cpp
[Edit] Note that this will likely interfere with any crash handler like Breakpad, but since it's primarily intended for development I'd simply turn it off in shipping code if you use Breadpad in shipping code. I intend to look into a solution at some point.