* lens lenght: ok, than a manual way could be great, for example Ctrl + Scroll wheel. I got the idea as I was gone through a "standalone" house. At the small rooms the view angle was to narrow. I know this feature from a pano viewer.
* Exposure: wish refined: it could be great to manual adjust the manual set exposure of a standalone. Useful, if interior and exteriors are in one scene and the auto exposure can't be used. For example Shift + scrool wheel or Shift + +/-.
PS: I loaded a standalone from somewhere at the web and run in this issues, so in this cases I had no control about the creation process. So, maybe it could be added to enable/disable the auto exposure at standalone level too.