Custom Mapping questions

So I've been playing with my Cue Master the past few days. The Cue Master mapping provided by DJTT hasn't been functioning correctly for me, so I'm working on designing my own mapping now. Pretty cool stuff, but I'm still learning what some of this stuff means. The logic behind some of the more complex FX combos kind of hurts my head. lol

So, one thing I noticed with the IG mapping for the Cue Master is that the Bmash buttons were only working for Deck B for me. I don't know if this is normal function, I thought it was supposed to be both decks, but whatever.

Question is, can you make the Bmash buttons work only for the focused Deck? Or would I just have to double map those buttons to an FX slot for both Decks?