Li Shenron
Legend
I think Thanee's suggestion are the perfect summary on this subject. If I may add another idea, USE BONUSES! That is, for a hidden door/compartment/item, set the DC high enough that is not beatable even with a 20, but only if the PC is aided or win a circumstance (or whatever) bonus from magic or from winning another check or solving a little trick via roleplay.
BTW, I think you CAN take 20 on searching for traps, not on disabling traps, this has been debated in our game, but to avoid complications, my players choose to use take 20 only rarely (it's worse for them, but they like facing tough games!).
BTW, I think you CAN take 20 on searching for traps, not on disabling traps, this has been debated in our game, but to avoid complications, my players choose to use take 20 only rarely (it's worse for them, but they like facing tough games!).