The state of Distance Field GI in 4.8

I hope I might get your advice / suggestion on a few aspects regarding scene lighting and outdoor scenes in general.

  1. What is a good size for a streamed level? 50 square meters (Skyrim size), 1 kilometer?

  2. Is there any good way to transition to fully indoor scenes right now? Since everything is streamed we need to get rid of the skylight when entering but with a door and an animation that opens together with some clever camera cuts will be enough to help with that.

What I am more curious is whether we can do lightmass on only those full interior levels? Will their maps stream in together with the level?