Rear fan & auto-power-off delay

[wavexx]

I rely on the rear fan to exhaust the resin smell into a ventilation tube. Works OK as long as the fan is on. However, the fan needs to be kept on for 5-10 minutes after the print is completed in order to clear most of the residual smell and prevent it to leak into the room.

I don't see any option in the SL1 settings (printer and/or slicing settings) to achieve this.

It would be great to have a "rear fan standby delay" (or similarly sounding option) option to keep the fan on for X minutes after the print is completed. A good range would be 0-15 min.

This option should also delay auto-poweroff for the same reason.