For a lot of things, like spotting traps and secret doors, I'll allow players to roll either Wisdom (Perception) or Intelligence (Investigation). Sure, why not? It keeps the game moving, balances Int and Wis a little better, and lets PCs of differing idioms succeed at similar tasks. I view it kind of like finesse weapons: you can be a Str-warrior or a Dex-warrior, and in some situations they are different, but in many situations they accomplish exactly the same thing.