I use your plugin all the time - its an incredibly useful tool. In one of my more recent projects, I realized I need to mix C and C++, so now I need to edit about 100 header files to add the extern C guard to C function prototypes, i.e.
#ifdef __cplusplus
extern "C" {
#endif
// List of C function prototypes
#ifdef __cplusplus
}
#endif
It struck me that your plugin would be the perfect place to accomplish such a think automatically - seeing as how you already have the mechanism constructed to surround code with include guards.
What do you think? I would be willing to submit a pull request myself if time allows.