oh that explains a lot...
i`ve always considered v1 as been fixed, based on the variables you have, using ALL runway distance available to a full stop.
so what i still dont understand is, why would we limit V1 in order to be able to stop with some distance remaining? I mean, in a real emergency event, i would feel very uncofortable to continue the takeoff knowing i could stop the aircraft after V1...
i dont get it!