Yamaha DTXpress/DTXplorer/DTXtreme

Hi folks from Italy!
I own a Dtxpress II since last tuesday, and I'm trying
to understand how it works, and tuning its sounds to
have my own drumset for using in my concerts..
Just two questions: 
1)I noticed that I have some problems on two zone
pads:for the snare, if I hit it hard, sometimes I can
hear a rimshot..this is because the pad is very small,
and the stick hits the rim... can I modify something,
so that the rimshot sound is heared *ONLY* if I hit
the pad under a certain power, and a normal snare
sound is produced if I hit it hard? (sorry for my
english!!)
2)With my acustic cymbals, I'm used to finish lots of
songs hitting crash cymbals quickly and repeatedly
(with a "shhhhhhhhhhhh" sound)..it seems this it's
IMPOSSIBLE with PCY cymbals, because for every stroke
I can hear the BEGINNING of the stroke,and the final
sound is absolutely unrealistic! Is there a solution
for this? I know, there is a MIDI note which
riproduces just what I want, but I'd love to get it
without changing anything in the drumset..
Thanks,
Gianluca(Italy)