I don't disagree with Lostclimate, my point is in WED all you need to do is add a light. Thats it.

With models you need multiple steps for the same effect. And plugins, or programs like MAX or MAya etc.

I liken it to the now obsolete 'flare'... it was much easier to click a checkbox then to make a 32 bit tga.

I've been at this tuf a few years now, and i don't know the first thing about lightmapping... starting with blocks is just easier for now is all I'm saying.

And one more thing about subtract... it can add significant time to the building for the engine. I, personally wouldnt even use it for doorways. simple doorways are just 3 blocks, and no risks of problems