I have found the Wx+T mode on our aircraft of limited practical value due to its very short range (40nm), and I usually just leave the display on Wx only. As previously mentioned, the fourth level of precipitation (Magenta) is replaced by turbulence detection (the same colour magenta) and the doppler function becomes active. I my experience I have found that the turbulent precipitation has to be pretty severe to get any reading at all on the display and I feel more comfortable seeing the standard wx radar colours and making my own assessment of where the worst turbulence is likely to be. I find Ground Clutter Supression (GCS) a more useful tool than +T to be honest.
cheers