DJM-A9: Pre-Fader FX

I wish I could set FX to be pre-fader, or whatever I would need to have the tail of e.g. Reverb or Delay continue to play out even when I put the fader down. Often I want to reverb out a track, and I need to turn on reverb, then stop the deck (but also remember to move the release knob to a reasonable place).

It would be cool if there were a setting where I could turn on reverb, slam the fader down, and have it not be so abrupt.