I propose a course that teaches you how to use audio clues to your advantage. Anyone with a sound card and a decent set of headphones knows how much better the game plays when you can actually tell the difference between a friendly vehicle and an enemy one just from the sound. With a little practice you can even determine bearing and approximate range of many vehicles just by listening.

Most important, listening for the sound of the enemy infantryman as he takes out his knife to stab you in the back while your sniping, allowing you to do a prone 180 and no scope him. (This section is strictly for SirSolo's benefit).

EDIT: After some additional thought, I'm forced to consider the idea that maybe a "sniper" course wouldn't necessarily be a bad idea. While the sniper kit in PR has gotten a bad rap, especially on TG, most of us agree that it still has the potential to be a powerful kit when used properly. Why not a course that actually stresses the fundamentals of good scout/sniping? The course would teach people how to move around on the battlefield covertly (something you can use in any infantry squad), teach people how to spot and report targets from a concealed position (another invaluable infantry skill) and finally, how to choose and take out priority targets without being discovered (the emphasis here would be on picking targets carefully: AT kits, AA, other snipers, etc) not simply building a body count.

I know I'll probably still get flak for a suggestion like this, but its something I'd be interested in seeing taught, even if I had to teach it myself.

Also; don't let my radical sniper views take too much away from my above-mentioned course on audio tactics, I think that one could really help people become better players.