Suggested

option of up to 6 pit strategy

Increase in strategy the option for up to 6 pit stops.
During the race the game sometimes crashes when you need to change the amount of fuel for the fifth and sixth pit stops.
putting this option before the race would make life easier and avoid being held hostage by these game glitches

You could ask for that.
In the other hand, you could change up your strats to use a maximum of five (5) stints ( go for the current four [4] stop maximum).

some tracks at 100% duration the current ideal strategy is 5 pits and can reach up to 6 pits depending on the track and pit time.

Have you heard of tyres calld Hard and Medium???


Judicious use of these strange tyre compounds can easily reduce the number of stops required to four, or even (Shock!  Horror!) Three stops...

Depends on race rules, but for refuelling races at 100% trying 3 stopping with Hards or mediums in say Turkey would be a disaster.  Even in no refuelling races Turkey is often a 5 stop,strategy

I'd love to, but it's much slower. Being able to set up 5 or 6 pits would be great if the UI on mobiles could be sorted

I agree about increasing the max number of stints in the strategy.
I feel that the game advanced to a point where the strategy system was left behind.

Yes Cole, you're Right, my problem was in turkey with refueling and temperature of 53°F, its impossible to be fast with medium or Hard tyres. 5 or 6 pit stops is the best choice 

Verdade , ja tive esse problema de acabei perdendo corrida por de que fazer cálculo errado de combustível no 5° pit

That's right Marcello! 

I have already given up on doing 5 or more pits because the application always gives a problem in the fifth pit when the desired number of laps is different from the amount of laps of the previous stint. 

We need a solution for this.