@studiolynga ... If you have Vegas Pro 17, go to C:\Program Files\VEGAS\VEGAS Pro 17.0 directory and copy HitFilm.fio2007-config and copy it into the VEGAS Pro 18.0 directory. Et voila. 'Edit in HitFilm' should now appear in the context window when a video event is R clicked.
That file should also be in Vegas Pro 16's folder as well - but I'm not sure about earlier Vegas Pro versions.
I tried to find the post and comments about this from early August, but the forum Search function does't seem to be working at the moment.