I wondered this same thing, however the pit limiter button seems to only work on exiting the pits. You press it as soon as you go past the solid white line at the pit exit to return to full speed. Entry to the pits still requires you to slow down and maintain the speed limit, manually - which is disappointing.
The barrier repair is complete and all the drivers are in their cars and are about to head back out to the track, the Mercedes garage have purchased a bulk load of Gorilla glue and are being seen smothering both Lewis and his headrest to the car - that headrest ain't moving!
Why don't we also introduce football while we're at it, as some drivers take part in charity football events... I can't tell whether the creator of this topic is serious or not because we are comparing two different sports.