Well, two things. First and again, too close to the end of the stile and the
screw will probably split any wood. There just plain isn't enough wood to
absorb being stretched by the screw.
Second, and assuming a 3/4" face frame I use 1 1/4" screws and only use 1
1/2" screws if I am working with 1/2" stock.
On the Kreg jig the 1/2" spacer block sits the hole higher on the rail so
you need the extra 1/4" screw length. It should be the same on any pocket
hole jig since the angle of the hole has to be such that the screw enters
the stile at it's thicknesses mid point. That means that for a 3/4" face
frame the angle pretty much has to be the same no matter who makes the jig.
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