The current table definition is hidden deep within the code.
User needs to copy it from within a php file, and execute it in the db.

Imho it should be instead part of standard ezp install scripts:

A - it makes it easier to enable/disable clustering at will
B - it makes it possible to include cluster-upgrade scripts in the standard sql scripts that come for updating eZP
C - it makes it easier to check for modified/missing/added tables in the "consistency check" page of the admin interface
D - two empty tables are not a big problem in the db anyway...