I should have added that the crosshair thing, like many other things, is part of an equation balanced by the game developers. Playing a computer game is nothing like real life, even if it does attempt to replicate real life. While playing on the comp most of your senses become irrelevant: there is no smell; you cannot detect changes in the wind, temperature or humidity; sounds are restricted to stereo from the front rather than being all round; you have no peripheral vision; you cannot talk to your [AI] squad, you have to use the keyboard; etc., etc., etc., etc., etc..
By messing with crosshairs you are changing one part of that complex equation without making a corresponding change elsewhere to balance it. It's ok for the player to do that - he can create his own compensations, should he wish to do so. But it's not ok for the mission designer to do that, which is why he can't.
The shoes were a reference to an old Two Ronnies joke that came to mind for no reason in particular. Something about an RAF tribute to the 45,000 men of Bomber Command who fought during WWII in Wellingtons, and the 296 who fought in pink suede boots. Don't quote me.