Suggested

Ban refueling

Add option for ban refueling. If we ban refueling, tyre and fuel economy will be more important and it will open more strategic options 

As an option yes. Mandatory no. 

Concerning your argument about more strategic options it's half and half I'd say. You have the option to stay out longer or try an undercut, but you will only have an TE (tyre economy) advantage. You will lose the combined performance of tyres and fuel, since fuel is fixed. So you won't get as much out of a softer compound, that you usually use with less fuel, than you did before where you had the faster compound and the lighter car, too. 

But as added optional gameplay feature I like idea the very much.

Taking a 'contrary strategy' which so often is a game changer in real F1 really isn't an option in iGP, due to the dominant 'drs train and boost' strategy. It is so powerful an effect that running 'out of sequence with pitstops is usually a bad call due to iGPs built-in clean air disadvantage. So ABSOLUTELY anything that gives other strategic options is worth considering. 

i think it can be a good idea, but then a lot need to be changed:
- timeloss due to tyre wear should start directly after the 1st lap
- the tyre temp need to be connected to the car weight (amount of fuel left in the car) and compound. the lighter your car the harder you can push. but then again, the harder you push the faster your tyre is wearing out.
- in race there need to be a bigger difference in laptimes over the different compounds (i tested with same fuel levels the soft tyre is almoust as fast as the supersofts now)
- boost need to go

Yes I like the idea of banning refueling. If the amount of fuel that went into the car was determined at the practice/strategy stage, with a maximum of 100 ltrs, you could decide to run light and fast but with the penalty of needing to save fuel towards the end of the race. Those who went for a heavier car may be slower early on but later in the race, with a lighter car and fresh tyres, they could push harder because they won't need to save fuel. 
I can see a refueling ban adding so many new strategy options whereas at the moment fuel is the deciding factor for when you stop. Imagine if your tyres are lasting longer than you expected, with no refuelling, you could carry on for a few extra laps but no matter how well your tyres are lasting, if you're running out of fuel, you gotta stop. 

I'm all for it. Maybe make it so that the league host can decide whether that league has refueling or not

i see this idea come up often.
why doesnt the developer react to it?

so? thats a good thing if you ask me.
if the manager want to take big risks of running as light as possible i think they deserve to get an DNF(if they get it wrong ofcourse).
besides, other managers also get more chances this way or steal a win by taking bigger risks than the safe managers
i would make it an option in the league

That problem would be solved by introducing engine modes (push, normal and save) or fuel mixtures (rich, standard, lean) 

if you can set the push level during training you can calculate the fuel use during the race. so no need to attend the race live.


well, its all hopes and dreams anyway. de developers never give an answer on this suggestion (or any other suggestion for that matter)