The ConsistDataHandler Rule is a helper rule for QuickDrive. It must be added to your session for the QuickDrive train placement functionality to work. Without it you will not be able to place new trains in the 3D Driver world. Other features of QuickDrive may also be disabled or not function.
The ConsistDataHandler rule has no configuration options, and thus needs no extra setup in Surveyor.
As of TANE SP2 this rule became redundant and is no longer required. Its functionality is built into TANE SP2.