V1, as mentioned above is NOT decision speed...its decision made speed/first braking action taken speed.
One airline I used to fly for, operating F28s mostly from limiting runways (very), encouraged the Captains to remove their hands from the thrust levers 5-10kts before V1. This was to ensure people were 'go' minded at that point and to remove the risk of snatching the thrust levers closed in fright after a loud bang. If you try to abort a few knots prior to V1 then you will almost certainly exceed V1 before you actually start to decelerate.
When I was CP/C&T at a Falcon Op I encouraged the same in my Captains.
Where I fly now (B767s) the company uses wet V1 always and this reduces V1 by about 10kts thereby building in a little buffer at the expense of screen crossing height at DER...only has to be 35' but is virtually always (on 2) approaching 1000' on the typically 12000' runways we operate from. The reality would be far in excess of 35' even if we lost one just before the wet V1 so the Captain removes his hand at the V1 call.
Chuck.