The purpose of credit card is to give you credit, i believe by setting a limit, it just defeats its purpose.

Furthermore, this will increase the workload of banks worker.

Can you imagine if your credit card unable to swipe because the bank personnel forgot / didn't call you up for the confirmation?

Treat it like your own cash.

It's unnecessarily to put card up side down just to show your name, rather you should not let anyone having any chances to touch your wallet.

Whenever you open your wallet or keep your wallet, check if all your cards available.

Rule of thumbs, having 2 different credit card companies, one international, one local. That should be more than sufficient. It's unnecessarily and troublesome to have too many credit cards.