As a pure rogue trapper/lock jockey, I find that I often feel useless, most notably when there is another multiclass player with 1 level of rogue, who can disarm, and perhaps use knock to open the doors/chests.

I would like to see a feature added for pure rogue trappers, such as a feat or enhancement that would allow us to place and set powerful traps of our own anywhere we see fit.

Perhaps a trap making enhancement available only to someone with rogue class level X with mechanic enhancements could acquire the enhancement to plant traps of different types and power. There could even be trap kits (something akin to thieves tools) for sale or as loot which would be used to make them.

The types of traps would be the usual traps you see throughout any dungeon. Darts, spikes, blades, fire, frost, lightning, sonic, acid, and maybe a few cool new ones.

The idea is that a rogue trapper would be capable of creating a gauntlet of traps which he/she could lure monsters through. Make the traps only last a few seconds after being triggered, and I imagine unable to harm the other players. Only allow x number of traps by that particular rogue to exist at a time, so if he has a max of 10 traps, sets up 10 traps, and one of them is triggered, he may now set a new one, and may disarm unused traps to allow for a new trap.

This would add a new level of intrigue and usefulness for pure rogue trappers, besides just disarming and picking locks, not to mention add another fun element of strategy for the groups.