We can now use multiple lights on a terrain.
We have created a new terrain material to handle upto 8 point lights and the obligatory direction light. As you can imagine this does come at a performance cost. So we have set up a combo on the terrain panel that enables you to switch terrain materials on the fly. This way if you don't require any more than the standard light you can select the default single light material and save performance but if your vision requires the extra lights you now have the freedom to be creative.
This feature will be in the next upgrade.