I was thinking in new idea about:
Add combine mission in Flint Country fields nearby LS ( but this mission is during SF and belong to it )
I mean like GTA SA offline when you use the combine and drive at the fields,
As well this mission depend on shortest time to finish it ( whenever the time shorter the prize is more ) like other missions
Also the prize for this mission coudn't be more than 3k, mean between 2k - 3k.