Another factor to throw into the melting pot (only relevant to certain old aircraft, eg Chipmunk, Hunter, JP in fact anything British with no nose/tailwheel steering!) is the use of brakes to keep straight early in the T/O run. The manuals for some of these aircraft state that the take off run may be increased by this but make no attempt to quantify the effect! I often wondered what the penalty would be but never found any answers.
I guess there would also be a decrement in thrust caused by the air entering the jet intake (or the propeller) at the sideslip angle and also an increment of intake momentum drag!
3 Point