I seem to have realized that you can put in each algorithm of Sextante all
the options originally planned for grass, by editing the specified command
file .txt which is (in my case) in C:\Users\
skampus\.qgis\python\plugins\Sextante\grass\description
So I did for the command v.transform, in order
If the interface is freezing, that means that GRASS is freezing (maybe
it takes too long to process or the data is invalid). If you were
passing wrong data, SEXTANTE would make a wrong call to GRASS and
GRASS would produce nothing, which will cause SEXTANTE to fail
afterwards showing an error
