[Miller]

I like this idea a lot, SL2 is missing alot of the overworld gimmicks SL1 had and I think this would be fine to be implemented into SL2. It could function similarly to the Ninja Training trait as well; opening up a whole new branch of talents for having the first detective trait that provide bonuses like the ones brought up in OP already. (Increased hearing distance/bonus to handguns) While the second would let you use and craft the tools.

I can't say I have an idea of what stat requirements the traits should have however. WIL/SKI/GUI all sound good to me.