"Warn about dangerous substances" option

[red-kangaroo]

Clouds of gas can be sometimes very hard to notice yet very deadly, and acid puddles on floor can mess your boots or legs badly, yet be hidden under items. An option to display an "Are you sure" message when you're about to step into gas or puddle of harmful liquid would be nice.

[andrewtweber]

Hm I feel like that was partly intended by the devs though