Kobolds are a major problem in my trap setups. Not because they aren't killed by most traps, and not because they can make it to the rift very easily without player intervention, but because they set off all of my traps without actually being effected by them.
This causes a problem where a kobold will run through my traps, setting all of them off, and causing them to all need to reset. Meanwhile, a wave of orcs will come waltzing through my defences because all of my traps are resetting themselves.
I've tried placing brimstone almost immediately after the rift (brimstone is one of the few traps that kobolds will be affected by). This helps immensely with the kobold sappers (the one's with the explosives) because they're normally the first ones out of the rifts, and it sometimes helps with regular kobolds, but the problem is that sometimes kobolds come after the first few orcs have already wasted my brimstone.
What is the easiest and most reliable way to deal with kobolds? I would prefer if there's a strategy that needs no player intervention, but I'm starting to think that I'm just going to have to keep an eye out and shoot them quickly.