Direct access to IPD callibration, the green lines crosshair from tutorial.
Due of users changes on the fly.
Probably near static position home button should be good...
...Near to sit position with lower floor than standard static, which would have too.
Panayot Cankov commented
I've just posted something that is very similar to this suggestion:
There is now an overlay when you push the IPD lever. But the overlay will be better if it includes the green lines crosshair.