Does not seem to get added to the roll when you do a *roll set trap check*.
[CHAT WINDOW TEXT] [Mon May 23 09:13:54] Toombs: *roll set trap check*
[CHAT WINDOW TEXT] [Mon May 23 09:13:54] Toombs: Set Trap Check, Roll: 17 + Modifier: 4 = 21
My score on my character sheet is 6 for Set Trap.
Testing other skill checks, they seem to be added. Let me know when you're in-game and we'll test this.