If there is one ATCO on and has the use of a fully serviceable ATM and is working just one aircraft how can it be dangerous ?
If there are multiple movements occurring at the time then fair enough but if you have just the one how is it more dangerous than if you provide a procedural service combined with Tower ?
At night time we already have different rules regarding Scratcoh so why not the use of the ATM in quiet periods?
A Blanket ban makes no sense , a local arrangement approved by SRG makes perfect sense to me. Having worked at a unit where only 2 ATCOs are rostered at night it would make a difference to both ATCO and Air Crew if they could either vector using the ATM or legitimately approve Centre Fix approaches monitored on the ATM.