I can't believe I haven't seen anyone suggest this.

I tried to have 24 AIs race some FO8's in a 500-mile race on KY1, and I quickly found out I couldn't make the race exactly 500 miles long. Why? Because LFS only allows you to set a number of laps for races with over 100 laps if it's a multiple of 10. (110, 120, 130, etc.) In order for the race to be the closest possible to 500 miles, the race needs to be 268 laps long. But because of this limitation, the closest to that is 270, which will exceed that a little.

Now, I know this is kinda nitpicking, but come on. This made sense in 2003, but we're not in 2003 anymore, this is 2017. This is an old limitation LFS has always had, but I think it's time for it to go.

This is due the way the laptimes number is coded - 1 is in the code 1,10 is 10,99 is 99,100 is 100,110 is 101,120 is 102 and so on.
And no - it has been suggested many times,I believe the update hasn't been made to not break up compatibility with older replays or something like that,not sure. So the problem is well known...
But most likely it's already in Scawens to do list,probably not in first few pages...

In insim the "racelaps" variable has a double-use for the different modes LFS has: practice (no limit) and race-length via laps or time limit:

So a change would break existing insim scripts, replay parsers etc for little gain.