I dont understand, do you want to make shifting smoother and or the shift knob to be shorter?
You can get smoother shifting by lubing your shifter links in your engine bay under your ECU. Do a search on that.
You can also get smoother shifting by replacing your transmission fluid with redline's MT90 transmission oil. It makes shifting much more smoother!
As for the height of the shifter, you can get a short shifter. A short shifter basically replaces the shifter shaft with a smaller one. TRD
, TWM, B&M and OBX make short shifters for our ceilcas.
Hope that helps!