Along with the icons, a glaringly 'unreal' element in our beloved game/simulator is our ability to fly serenely through our countrymen's aircraft with no worries. This removes a huge impediment from our consideration which real life pilots were forced to contend with. Is it time to add friendly collisions to, say, the CT arena? I understand that this would be too radical a change for the MA, as it would slow down airport traffic considerably. But the CT is lightly populated now. To avoid willful crashes we could use the old ramming formula - where the pilot who impacts someone else with his nose dies, whilst those rammed up the rear are spared. In side to side or top to bottom collisions both parties would share the consequences of the 'accident'. I think this would add a necessary tactical element which had a very big influence on the real air combats of WWII. It would demand more attention and skill from all those flying in the arena, but would that be a bad thing?