Performance and Generic Config after install

As an aside to the "[GENERAL] Advantages of PostgreSQL" thread going on
today, I have wondered why the initial on install config of PostgreSQL
is (according to most posts) very conservative.  I can see how this
would be a plus when people may be getting PostgreSQL as part of an OS
in the Linux world who may never/rarely use it.

I know that in reality tuning and sizing all of the parameters is a very
database specific thing, but it would seem that if some default  choices
would be available it would give those testing/evaluation and trying to
get started a shot at quicker progress. Obviously they would still need
to tune to your own application.

Some dreadfully named, possibly pointless options?

Unoptimized / low performance -  Low load on Server   (The current out
of the box)
Production Non Dedicated   - PostgreSQL is one of the apps sharing
server but is important.
Production Dedicated Server   - The only purpose of this box is to run
PostgreSQL

Perhaps this has already been suggested and or shot down?

Oisin