Once you have multichannel routing set up, the EZDrummer track is basically just in charge of EZDrummer - the fader won't affect the other tracks.
I'd recommend setting things up like this:
Code:
Drum folder
-- EZD
-- Kick
-- Snare
-- Toms
-- Hat
-- Ride
-- OH
-- Room
etc
EZD's signal goes out to the individual tracks, and they go up to the Drum folder. Use the folder to control the overall level and mute the entire kit when needed.