How to disable “one more minute” on Screen Time?

We have a running battle with the kids who abuse the 1 more minute ability of screen time. How do we remove the one more minute feature whilst still allowing the kids to send a request?

The control content feature is so complicated and so embedded that it's beyond sensible use.

Ideally we'd love

1) "no means no" access to games unless requested - no extra minute her per app (if 60 mins of apps have been downloaded this means an hour of time wasted)- can this be done via content control? If so what apps and what age categories?

2) No access to videos / YouTube for the kids within other apps like whatsapp

3) We've noticed that if the kids turn their data off they can continue to play games without our permission as the screen time control changes dont affect their phones until the data is back on.

Many thanks