I don't think any other users of the plugin are using the Studio Light family object - since it has no geometry. They all use family objects for lighting which have geometry.
I am the wrong person to give this advice, but I just did the following:
1) Open family editor, load Studio Light, added a square box around the light (using Extrusion), created a new material called Octane Emitter, tick the Self Illumination box, assigned the material to the box, save over the Studio Light or as a new name
2) Load the new Studio Light into a scene, open the plugin, select the Studio Light - the Octane Emitter material will be selected in the plugin, set the opacity to 0 and increase the power (to maybe 30000), rightclick "Save as Default"
A cube is not a great emitter shape (a single sided or double sided plane would be better) - but it's what I could create in 1 min. You would need to tweak the above process, but hopefully it gives you an idea of what can be done. It is recommended you attach an IES distribution to these types of emitters (see the manual for details).