For strategy purposes, here is a lapchart:

http://moe.lfs-tracker.de/lap_chart.php

You can post feature requests in this thread.

Added lap numbers. If you find a double lap number, remove one of the laps from the table, if you miss one lap you'll have to assume a certain laptime.

Okay, feature requests:

Is it possible to denote pitstops in the chart and also give an average laptime for the time between stops?

It shows pit stops now (laps marked by P).