Allow passing on race start before the S/F line.
Single file restarts.
On a normal, standing, race start passing is allowed before start/finish, as well in all other LFS series and in real life when Rolling starts are used. It's unnatural for drivers to hold their position with cars left or right and in front and behind. Once the green flag is dropped the instinct is to get the best out of it.
Race restarts are different and since single file is then used it's absolutely normal for leader to set pace and have overtaking allowed only after s/f is crossed since the yellow flag period was there because of someones misfortune, all the gaps had been closed so it's only normal to prevent people getting a jump in this situation. But on race starts it's a clean ground for everyone and these two should be distincted.
In rules I don't see passing forbidden before s/f on race start on rolling start, but there is a picture showing double file and passing being illegal, so it's a bit contradictory. Maybe it's because you've been using double file on race restarts so far, if so, then single file should be in place for race restarts.
Maybe you don't want to follow the rest of the world in this two areas, but those rules are commonly used everywhere because they work the best and also those rules are the most fair. Though, maybe nascar racing uses different rules, this series (World TBO Championship) is not oval racing and it would be hugely welcome if you would use circuit racing rules for this two situations.