Hi,
since we have the switch between spherical and dome in HDR images, me and many other users would love to have the feature known in Autodesk VRED where you can animate the projection of your HDR dome. It is really easy and fast to set. Also it produces correct motion blurred reflections too.
Head over to 9m25s to see this awesome solution.
I would love to have a gizmo like geometry in my viewport where i can set an animation AND where i can also scale the projection dome. This is really handy if you have a HDR on a Road for example.
I also made some examples for you guys just to see how much better it is to have this kind of ability.
Thanks.