Cewl, loads of people blaming eachother again for being bad pilots and all sorts. Maybe I'll join in <img src="cool.gif" border="0">
Anyway, on the overweight, outside performance envelope T/O. I'd have to stay on the ground too! And if you seriously consider doing your take off performance calculation and then going anyway because otherwise it might be inconvenient then why do the math at all? Just go the end of the runway, wich ever one someone feels like, give it full whack on all four and start pulling when it might be somewhere close to Vr. Sorry, that does not sound like a good plan to me!