Yamaha DTXpress/DTXplorer/DTXtreme

I have a Yamaha DTX 2.0 (not DTXpress II), it has: 8 stereo + 2 dual 
trigger inputs. All the pads are hooked up to the 8 stereo inputs 
producing 2 sounds each (or 16 sounds). My kick drum is hooked up to 
one of the dual trigger inputs and the other dual trigger is free.

My questions are: If I hooked up a typical DIY dual-trigger drum 
(piezo on the head, piezo on the rim) to one of the stereo trigger 
inputs, that would not work, would it?

Out at http://drumbalaya.com/drum-module-comparison.asp it says DTX 
2.0 Dual-trigger devices use up two inputs (e.g. no dual-trigger 
snare input) What does that mean?

How do people typically do this then, hook-up the DIY snare to a Dual 
trigger? 

Any recommendations on a good drum modules for DIY eDrums ?

Thanks.