DJM 450 Effect LEVEL/DEPTH knob should have an option to be "Send" rather than "Return"

I want to use the ECHO effect sometimes on a track. But when I've had enough of it but want the track to keep playing I have to fade manually down rather than use the natural tail of the ECHO that's already in place (during which time I'm still sending more audio to the ECHO which may be undesirable if the music is different in that portion of the song) If the LEVEL/DEPTH was a send to the ECHO effect then I could abruptly pull the level to zero and have the ECHO trickle away gently as god intended.

THANK YOU