Just a minor tidbit from the project I’m currently working on, likely to premiere at GenCon 2011:

The necessity of linking multi-kilometer tall towers by primitive bridges, or building simple ladder, ramp, or lift systems on the outside of said towers (with minimal protection from wind, rain, and carelessly dropped Altairian pseudo-banana peels) leads to many opportunities for the GM to say “Let’s see, you’re two kilometers up, so that’s a -500 to your Breakfall roll.”