Creating a Unity 5 shader that uses external lightmap and internal GI

For my project I'm finding that Unity's lightmapping takes way too long for the quality. I managed to get some basic functions working on plugging in lightmaps I bake from Blender's Cycles. I'm wonder if plugging it into the illumination slot is best or if there is a specific way I'm supposed to set the shader up to that it can work well with Unity's real-time/pre-computed GI.

Any insight on the matter would be great.