Maybe there could be a gravity well level, like on a gravity generator of an orbital platform. The rockets/missles and any other solid projectile weapons would either fall quickly or fly upwards. Maybe it would switch back and forth by turning a switch or just be on a timer. It would be like a funhouse level, and also those who complain about "rocket noobs". Maybe when people jumper they would instantly fall down and jet packs would barely lift off of the ground. This would basically eliminate grenades if it fell quickly and would make the standard infantry class much more useful.