This very discussion about "time/distance to V1", and the obvious possibility that is automatically checked / flagged by a system, has been had recently on pprune, but I don't remember on which thread.
If I'm not wrong, the outcome was that even if at first it seems something easy and inexpensive to implement in the interest of safety, it can also be opposed for reasons that I don't remember now, but are quite convincing when you hear them.
I do remember however that certain pilots stated they made silent or briefed commitment to abort if they not had reached, say, one half of R/W at the 100 Knts call that some do.
One further demonstration of how difficult is to have changes in the aviation industry and how tortuous is the road to the Good.