For one reason or another I can't run Project Nevada without encountering crashes, I've managed to replace the few things I couldn't live without but I'm stuck with the default New Vegas scope system, are there any other mods which add in extra scope functionality, I could even live without the cool mouse wheel stuff if I could find a mod to toggle scope rather than having to hold the mouse button

You can find one http://newvegas.nexusmods.com/downloads/file.php?id=37060.