Bringing this back from the dead. I bought a B&M short shifter.
I wanted to know the logic of short throw and transmission damage. This is a good explanation:
According to rsgear.com:
"However the driver needs to understand that the time it takes to shift is predicated on how fast the synchronizer can complete the shift without gear clash. When you shorten the throw of the shifter it is possible for the driver to be moving the stick faster than the clutch can fully release, and before the synchronizer can complete the function of matching the input shaft speed to the output shaft speed. This results in grinding or blocked out shifts as the timing has been altered for the function of the components."
It's a great article, worth a read. Based on that, I will probably return mine and put the money towards a more worthwhile mod.