May I point out to all the jockeys amongst us who have the fortune to use long runways, that there are what are known as displaced thresholds. As you backtrack, the piano keys come and go, the white lines come and go, but as long as there are long pointy arrows, you are good to go a whole load more. In fact may I be so bold as to suggest that, if you are using performance figures from the 'full length', you are REQUIRED to go right to the very end. You might not be able to land on it but if you're taking off, its yours if you want it.
On the day you reject at V1 - 1kt, you will thank the lucky stars you elected to use the full length, and not the intersection departure you accepted for no good reason. (Not that this is relevant here).
Therefore, as a principal, if a crew elect to go right to the allowable end for a departure, good luck to them.