Isn't that exactly like Heavy Rain? When the shop is getting robbed, you get to move the detective around. You control his speed (and stealth) and when you have options, they appear as control presses.
It's AFAICS the only way to do this game, and as you've described, the way it was done in Fahrenheit. Allow the player to move wherever they want, and make them aware of options as they become available.
Sure, but with time pressure, and having to do multiple things, it gets real easy to overlook something. And you'll have be close to a object for the button prompts to appear. If your not going there with the intention of using it, you can walk right past it without a button prompt appearing. In my example its better to leave the diner if you can't figure out how to do everything you want to do fast enough. You may never know how many options you truly had available to you.
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