Odoo currently allows the same logged in user/operator (let's call him 'Fred') to start more than one work order simultaneously.

e.g. Fred can view the work orders in list view and select "start" on each work order shown - which starts the timer on each work order

We want to stop this from happening - or at least have the operator warned that this is happening - as allowing this will pollute the efficiency stats for that user and so we won't be about to trust that the data is accurate for each user.

I haven't seen any option in Odoo settings.  I assume that this is possible only via Odoo code customisation?