[dungeonguru]

If you're talking about the "Custom Monster" that you make on the fly, I don't know of any way to do it besides writing your own adjustment that borrows code from creatures like the giants.

post-level 10000

foreach pick in hero from BaseWep where "wCategory.Melee"
        eachpick.field[wReach].value = maximum(eachpick.field[wReach].value,10)
        nexteach

The "10" in the script sets the reach to 10 feet unless the reach is already longer. If you modified this into an adjustment, you could set that to the pick value on the adjustment. (field[pAdjust].value). Just remember to set the minimum to 0 and the maximum to whatever you want.

You could also just simplify that whole thing to

foreach pick in hero from BaseWep where "wCategory.Melee"
        eachpick.field[wReach].value = field[pAdjust].value
        nexteach

which would set it to whatever value the adjustment has.