Is it possible to automatically add the visitor elevation based on the selected level?
I wondered the same thing before releasing the new version. But it depends on how you use the level feature and the eyes elevation you chose. Maybe an additional Adjust visitor height when changing level option in the 3D modification pane (or in the future dialog that will allow to edit virtual visitor location and angle) would be nice?PS: not sure where should I mention about this, if this post should not belong here, pls move it to appropriate forum.
Done 
The best would even be in feature requests tracker.
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Emmanuel Puybaret, Sweet Home 3D creator
