Personally I find clicking the button 20 or more time an irritant when Qualifying Laps are set to a high figure. What a slider or dial of some sort?

The title lead me too suggestion -

We can only set the number of minuts, it could be changed to laps.

Seahorse - Try right click or write /qual 100 000

Shame that the righ click is not obvious at the time - slidiers are used elsewhere in LFS...