I have to dissent with what seems to be the prevailing interpretations here. While playing fast-and-loose with ranges and giving pikes a Short Range attack is all well and good, I think this is only suitable to a very fantastic/epic/heroic style of game. Which is fine! If that's what you're playing, more power to you, and the Short Range interpretation can work as your heroes whirl around the room impaling baddies with abandon.
I think there's a little too much D&D influence in this interpretation, however, both equating the ranges to fairly literal brackets where Engaged is 5ft and Short is your 10ft Reach attack as well as committing D&D's decades-old sins of weird fantasy brainbugs about medieval weapons. I was very happy to see the thinking that went into Genesys' fantasy/medieval weapon list, because I think it does a much better job of capturing the tactical value of various weapons than, say, D&D. Genesys has established the precedent -- and rightfully so -- of weapons with longer reach having the Defensive quality, as with the Halberd and Spear entries. This models the actual tactical advantage of reach much better than trying to fiddle and quibble over specific range brackets.
A long pike like a sarissa is probably best modeled by removing the Pierce quality from the Halberd and perhaps giving it the Spear's Accurate and/or increasing its Defensive to 2. Combat should be abstracted to the point that whether someone is 5 inches away or 5 feet away at any given moment shouldn't really matter (those are both well within the concept of "Engaged"). A fight goes back-and-forth quite quickly and the mere presence of a spear/polearm will keep the opponent naturally at a distance anyway, which is what the Defensive is representing -- whether you're being stabbed from 5 inches away or 5 feet away makes no difference, mechanically; the important thing to model is that if you can be stabbed from 5 feet away, you will have a lot more difficulty using your 5-inch dagger to attack your opponent, hence the 1-2 Setback dice.
If you really want to strangle your players with pedantry, you can apply GM-fiat Setback dice to the pike-user's attacks if for some reason the combat has devolved into face-to-face grappling where the pike can't be used as effectively, or whatever. But as said, this shouldn't happen most of the time, because the threat of a long stabby thing is quite real to anyone with a sense of self-preservation, preventing someone from simply face-tanking a pike-wielder and laughing "Ha ha, your Reach weapon can't attack me this close!" That's just a silly D&D-ism with no real basis in reality.