Minimal to whom? I don't need an Editor, I just need a hardcore engine which rocks. So far nobody has been able to do that, and I count on Leadwerks. Although Shiva can do technically much more than Unity and any other engine, it lacks of command line interface, I hate the Editor interface. Leadwerks must have a command line interface, because its Editor is built on it. I don't think Shiva uses projected shadows, but it uses shadowmaps. Not sure why Unity does not support shadows, maybe it's because C# is too slow for that, or their pricing policy has bugs.
My worst fear is that Leadwerks 3 will be a nicely polished FPS maker, but actually lacks of realtime shadows.
Then I would still do even my next game with Shiva, which sucks. I WANT to use Leadwerks.