Hello Mark.

Let me start with a simplification: there is no Reality 2.0 anymore. That was the initial release of the 2 series. We are simply talking about Reality 2, which is currently at version 2.5. That requires Studio 4.5.1.6 or above.

Reality, which is the interface to use LuxRender, allows you to use any kind of light. It is not designed for exteriors alone. If you look at the Reality Gallery on dA ( http://reality-plug-in.deviantart.com/ )  you will see plenty of images done with indoor lighting. Here are a few examples:

http://fav.me/d5idnvb
http://fav.me/d3bf4mj
http://fav.me/d5iwqar
http://fav.me/d3beceh
http://fav.me/d4v4lga
http://fav.me/d4n8sd5
http://fav.me/d45qzpy

Now about your questions.

Reality and Luxrender are not made to do any modeling. Reality is the plugin that interfaces Studio with LuxRender. It takes all the Studio lights, materials and objects and it converts them to the format used by Lux. It launches Lux automatically so that you can get your scene rendered in Lux. It provides a fully-features material and light editor that give you complete control on the materials and lights for Lux.

Lux is designed to simulate faithfully the real world. So, if you take the supplied mesh light in Reality, which is like a large studio softbox, and scale it up very large you will get, like in real life, very soft light. 

If you are used to real light then you are in for a treart. Reality and Lux only work with real light. That means that all the photographic tricks, like boucing light off a reflector, work exactly like in real life. 

If you want a gold reflector you can place a plane in the scene, select the Metal material in Reality, select the Gold preset and you have a perfect gold surface to bounce your light around. 

I'll gladly answer any question that you mightr have.

Hope this helps.

Paolo

https://www.preta3d.com
FB: https://www.facebook.com/RealityPlugIn
Tw: @preta3d
G+: https://plus.google.com/106625816153304163119
The Reality Gallery: https://reality-plug-in.deviantart.com