Indeed an interesting idea! As you might know, baggage claim and customs are still to be (and the last parts) of the passenger simulation cycle to be implemented. In terms of customs, there’s a lot you could do and the only boundaries we have is the time aspect as I’ve written about earlier.
Customs, in real life, takes a lot of time to process and even though we can tune it so that customs in ACEO are fairly quick to process, each additional simulation layer (searching of bags, criminals, immigration issues) will add to that time issue. So it’s all just a matter of balance… but it’s indeed interesting ideas and something I think we’ll have to include, at least in some aspects, of immigration.