That's what I'm doing now, saving as a new wav file, but cutting and pasting would be a lot easier since I'm starting with a file in a Vegas project, then opening Sound Forge to do more detailed editing on the file, then moving it back to Vegas to integrate into the production. It seems to me like they could make the two programs compatable in that way.
If you're not changing the length of the file you are editing then it will automatically update in Vegas after you've saved it (under the same name) in SoundForge. This is the cool thing about the events in Vegas being simply refernces to files rather than the files themselves. Implementing a Cut and Paste between SF and Vegas bypassing file saving would introduce all kinds of nightmarish file management issues....
1) select event in Vegas
2) Ctrl+E to open it in SoundForge
3) do your processing in SoundForge & Save
4) Switch back to Vegas
Mike K
PS it WOULD be useful to have a single button in SoundForge that saved the file and took you back to Vegas in one click.