My Findings under Windows 7 Pro SP1 64Bit NVIDIA GeForce GTX 970 (Japanese)
【Findings】 Tolerance of Mirror Selection
1. By clicking the [Mirror Selected] button after the original selection, the symmetrical faces are selected
automatically, however, the Symmetrical faces are increases unwillingly even if the Tolerance set to '0'.
This symptom has been inherited from CC1.52.
2. [Shrink] Button is provided, however, when you push this button, both Original Selection and Symmetrical
meshes are released.
Tentative Solution:
When the exact same faces are needed, push [Ctrl] key and click the target face(s) by LMB (Left Mouth Button).
Thank you,
Hiro