The same can be done for omni lights. Just tell them what sector they are to be included in. To set the falloff radius of the omni lights, go to the lights Attenuation Paramaters tab. In the Decay frame set the Start to which ever value you wish to be the radius of the falloff for that light. Omni lights can be coloured and whichever colour you set in max, that colour will show up in Crystal Space.
Exporter needs to support more objects.
It needs to be easier to include objects in a sector, perhaps some sort of grouping needs to be done. Exporter needs to package the materials along with the world file nicely into a zip which can be dropped in the Crystal Space data directory.