I have heard people complain many times on the server about people killing ‘fresh spawns’ and then folks saying ‘you can’t tell a fresh spawn from adam.’
How about some kind of visual indication of someone packing? If you are carrying an M4, people should be able to see it. If you are carrying nothing but a rock, you might be more likely to be left alone. Perhaps other indications of how much people are carrying, like a backpack that grows the more you have on you?
Also, putting on clothes should take a longer. Folks might reconsider running around ‘naked’ carrying an M4 and full Kevlar if they can’t equip it all fairly quickly.