Don't use it
It's very bad still. Read the code, load it into your database at your own risk. Actually, read it at your own risk too.
The GUCs the module defines are:
A boolean that enables or disables using SAIO for planning. If true, all queries will be planned with SAIO, if false none. Defaults to true.
A floating point seed for the random numbers generator.
Scaling factor for the query size, determining the number of loops before equilibrium is reached.
Factor determining the initial temperature of the system.
Factor determining how much the temperature is reduced each time equilibrium is reached.
How many moves without a state change are considered a freezing condition.
The algorithm to use when generating consecutive moves. Available algorithms are: * move * pivot * recalc