However, you can do the following with Legend Views:
- Save to Project as Image (just right-click on the Legend View in the Project Browser - you will probably have to open or activate the view before this command will ungray itself)
- Export the View as an Image
- Export the View as a DWG
If you Export as a DWG, you could then Link that DWG into other projects. When you want to globally update the Legend View, you could re-export the Legend from the original RVT project and over-write the Legend DWG you exported and linked earlier. You would probably have to tweak the visibility settings a bit to make this Legend-export-link method to work effectively.
Hope some of these ideas are useful to you!