We place the torque call out on the fastener right next to the balloon on the drawing. This makes it easy, as someone looking at the drawing and assembling the product does not have to leave that area on the drawing and locate another table to get the torque info. Some of our drawings can be quite large and span mulitple sheets. Also, regarding torque tolerances, keep in mind that a typical torque wrench is only accurate to within +/- 30 to 35%. Its best to place a torue value on the fastener that is safe for the tool that is intended to tighten the fastener. Other methods of more accurate tightening of a fastener can be used, but are generally more costly. I like the approach of designing in an acceptable range so that the least expensive method can utilized and still have a quality design. Of course, this is different for every company's products and the environment they operate in.
Pete