I really don't have a problem hitting a trap under an item, per se. What I DO have a problem with is not being able to know there's a trap under the item, because the item is obscuring the trap.
I'm not sure how, but this has never been an issue with Crimson's server.
When you kill a monster that needs to drop an item, and where it wants to drop is a trap, it merely drops next to the trap. So yes, in theory you could see a trap because you just killed a wyrm and have 3 items, a blank square and 3 more items after it.
When the winds of change blow hard enough, the most trivial of things can turn into deadly projectiles.