If you don't care about anybody's opinion except Pyro and HiTech's and want a prompt answer then emailing them would be quicker.
As for part 2 of your question .. yes the arena settings do have controls for modifying the lethality of the guns for AA, bomber, fighter, etc. (have to double check to see if fighter and bomber settings are seperate or one control for both .. AA and planes definetly seperate lethality settings) SEA often we CMs reduce the AA lethality for events.
Forgive me for answering that bit even though I am not Pyro or HiTech.
But you might want to ask what the lethality settings for the MA are set too.