Danger zone or Danger ahead "free signs".

[RemingtonRyder]

Well, truth be told, both a toggle and a danger zone would be useful, since pawns who get prioritised orders to do something won't necessarily follow a safe route to their job location.

However, if you simply place a danger zone and don't toggle off autonomous activity, some scamp will find a way around the zone - perhaps a door that you forgot about - and toddle about heedless of the things trying to eat his brain.

Certainly, it's possible to avoid scenarios like that. If the default danger zone selects the entire contiguous area from the point clicked, then for example, outside is completely barred when you click outside. If a room is breached (but the door is still there) then you click the room, it's now barred. If a door is knocked out, then the room now exposed to the outside is barred.

[Kegereneku]

You way of imagining danger zone around door intrigue me.
If I understand right you'd consider danger zone the same way as prisoner room.
Problem I see is that it only work if you build your colony with wall all around, or in a mountain.

Myself I'm thinking about it more like "Home Region", except with filter. Drawing line/zone all around the base (in straight cubic line). Then have filter (like stockpile) to forbid colonist from crossing it.
If we fear forgetting about it, we could make so that unlike Home Region which is invisible, the danger zone would appear as long as a toggle is on (like stockpile or beauty).

[RemingtonRyder]

I'm worried mainly about forgetting to place enough zone to combat wily colonists who want to haul that bit of steel inside. It's a good thing there aren't windows, 'cause they'd be climbing out of them straight into a horde of zombies.

[gophertuna]

Or perhaps a setting on the colonist or the whole colony that prevents them from leaving the home zone, and/or return to home zone immediately.

[Stealth]

I made a thread on this exact thing. I wasn't aware it was already suggested (but I also didn't bother looking lol) But ya, +1 because it's a big issue.