Well in my lspdfr.ini WorldEvents.IntervalMultiplier is set to 1.0f and WorldEvents.MaxNumberOfEvents is set to 1. So I don't think they're disabled.
And LSPDFR isn't trying to spawn a supposed "Vector3" car but it's trying to spawn "lapd3" which is an add-on car from this pack :
I also had recently a crash like these with others models like the vanilla police riot and another add-on CHP pack. But these crashes happen since I installed LSPDFR 0.4.1 knowing that with LSPDFR 0.4 I haven't got crashes like that.