I was fooling around in the MoP beta and I noticed a nice quality of life change to Trap Launcher. This is now a toggle on/off ability.
What this means is that while you have it on you can launch any of your traps without having to click the Trap Launcher each time. The Trap Launcher stays on until you cancel it. If you want to drop a trap at your feet, just turn off the launcher and activate that trap.