Normally if you kill monster silver you would get silvers immediately. How about if you not moving you not picking up loots and silvers. Silvers and loot will dissapear or unbound that other ppl can loot in 1-2 mn. It should very effective agianst those AFK farming.
Item and silver has different loot range. You shouldve noticed silver loot range seems longer than item loot range. Usually afk sorcs cant loot every items because they cant reach it without moving closer, but they had no problem with silver. By making silver loot range the same as item loot range, people will be forced to atleast move their character slightly from time to time otherwise they will gain nothing. (unless they are cheater or botter but that is a different matter)