That was really difficult to do, and it took a long time to even start getting in the air. Both of them can't walk at the same time; they need to inch their way up very slowly, and, needless to say, it's very slow. This doesn't work with g_shove on.
No, mappers don't need to nobuild anything, because usually single wallwalkers usually can get up on a ceiling at S2 much easier and much much faster than with another granger. Karith no-wallwalked its sky correctly. The only "decent" map that hasn't is atcs, which is the only map really affected, and even then, eggs built on the sky can be easily destroyed.
This barely affects gameplay / balance, while making the game slightly funner. Being able to wallwalk slowly with somebody else in the air doesn't change much at all. And if you think you doubt this, go try playing domination yourself.
