I found that the HSHIFT TYPEG have some issue on neutral gear,
There have a 2-4 second delay when shift into neutral, so when shift with clutch enable,
would not be see the shifter pass through the "N" on the gear indicator,
and if not push the clutch then shift, it will stay in previous gear all the way
or turn to neutral with few second delay.
I email to Frex, finally he reply this problem maybe cause by the different
between the hardware design, the original one is use potentiometer but
Frex use a switch for the axis.
Switch response quicker than potentiometer that might have a confusion
to judge for neutral.
Frex said not quite sure, they still investigating and hope can fix it by software.
It didn't cause a big problem in GT5 gameplay actually,
(seems we can't do nothing with double clutch technique in GT5),
but still want it to be perfect.
P.S.
I post this problem report on their youtube channel and their official forum after I haven't receive
any useable answer with email over a few weeks ,both got removed immediately .... ,
but then, they reply my email in very quick response .
I don't know why. What's wrong with it ?