yes you can, you would just need the DD brushless motor, a brushless esc and a servo lead, as well as the lengths or cord to hook the motor up to the esc.
basically you splice the power lead to the esc into the jst lead that goes to the 4 in 1. After that you solder on the servo lead to the 4 in 1 and run that to the ESC making sure to solder the outside two wires, and not the inside two. The instructions are here
http://www.heli-max.net/mediawiki/in...ushless_Part_2 but make sure you do the tail motor and not the main.
Then you just run the wires for your tail motor from the ESC and that should about do it.