An interesting thing that can also be played with, with lower gravity. I could imagine trees could grow much higher, as the gravity restrictions on structure and "pumping" water against gravity would be less. That justification could be used by map makers to have giant skinny trees. Additionally, building in a lower gravity environment could also be built less "sturdy" and be taller / skinnier in a city environment.
If you want to go extreme, you could have a low gravity moon with no atmosphere. That could make serious changes to the heat dissipation . In real life, heat-sinks dissipate heat into the surrounding air. With no atmosphere, heat dissipation would be a lot slower, and primarily to contact from the ground (along with radiated heat).
Atmospheres also regulate temperature. This is why one side of the Space Shuttle in the sun is hundreds of degrees, while the shadow side is way below freezing. A no atmosphere moon map during the night would be very very cold, while during the day (sun is out, but sky is still black), would be very very hot.
Thirdly, no atmosphere would severely reduce any sound propagation (all through the ground). So explosions, and firearm reports from other mechs would be muted (completely silent on a jump).
Edited by Soda Popinsky, 28 January 2013 - 09:33 AM.