Use -nosplash instead

"The only way this is possible in Arma 3 is by scripting, which is quite jerky and looks bad."

That's probably the reason why it's not in the game. Be patient, its safe to assume that most features in previous versions will also be in this version.

I also am having a problem with items dropping when players disconnect, allowing people to quickly relog and dupe them. removeAll... with this command would also save that problem that no one seems to be able to help me with.

I also remember docks being glitch in ArmA 2. This AI always spawns partly inside the dock. Sometimes it's down to his feet, sometimes to his knees, sometimes to his bald head.

http://i.imgur.com/jyPQJIO.jpg