Transfer Lightmap Array Values from scene to scene

In Unity 4, I could manually edit the lightmap array and index value of a scene, thus allowing me to reuse light maps in multiple scenes that used the same geo, with the same UV layouts.

In Unity 5 we only seem to be able to load in a light map snapshot. This does allow me to load the lightmap across multiple scenes, however it doesn't seem to preserve the index values for the geo in the scene itself, and seeing as I cannot manually edit the index values, the lightmaps do not display correctly.

Does anyone know if the light map indexes are supposed to be transferred with the snapshot, or i there is anything in the editor that would allow me to do this?