Touchdown Point
Landing performance on the Emb-145 and i,m guessing on a B737 and any a/c assumes a touchdown at the correct point for that particular airfield, i.e 300m in generally-fixed distance markings. If you land beyond this point you compromise the calculations. On a 3000m runway, practically it makes not much difference, apart from heating the brakes up too much with a flap 22 landing (standard these days if performance allows). Unfortunately to make the 300m point in a barbie jet the technique is more akin to a T/P aircraft, get low over the fence and drag it in. Not text book but reduces the risk significantly of ever running off the end. PAPIS and glideslope to touchdown works far better and is essentially set up for proper medium sized aircraft e.g 737. Conversley a very large aircraft e.g B747 would look to land beyond 300m so the main gear touches at 300m. See "Handling the Big Jets' for technique.