I have done only 2000km but I haven't experienced stalling. It is true that the bike can stutters if you go really low on revs (probably like any new bike with euro 5+ as their mixture is too lean). I foresee this being an issue if you use it a lot.in the city. For me, living in a small town with little traffic it is not a problem. And for the legal speeds in Spain (30-50km/h in towns) you don't even need to use second gear.i am about to receive my a Vitpilen 801, I have been reading this forum since i ordered the bike, did not know about this "problem".
My quesrtion is quite simple, is this really a problem or you can deal with it not using the FuelX you people are telling...
I do not like to make changes in a bike, specially ECU or electronics changes...but to be truth stalling a bike on the road migth be a great safety problem...
To sum up, the bike has KTM DNA and doesn't like going slow. Ride it as if it was stolen and you won't experience any problems (besides traffic tickets hehe)