I started experimenting with FPSC when new camera commands came out with v1.18.
If I lower the player camera height to 33% of the normal height and then scale models down by 33% then this would give me a larger perspective in the game. So I tried it. And it worked better than I thought.
So essentially I had 330% more working space on the editor. I could fit in more scaled down models on to my FPSC Editor grid.
This works great for outdoor level. But for indoor levels its quite difficult because a person would have to scale down segments for passages... etc.
Things that I need to overcome:

Jumping and crouching doesn't work because the camera it as a fixed height.

Walking up and down different levels of height.
Um, yeah. Thought I would add my 2 cents.
Thanks,
Landman