ADDLOCAL Parameter Values for Silent Istall

Noticed in the documentation that the values for this parameter can be found
in
wxs/pginst.wxs, but have not been able to find this on either an installed
platform
or on the source disk.

I have been Googling for the values that can be set and what they are useful
for,
but none found. Hate to use 'ALL' option and tie up space for stuff I don't
need.

So far, we have been using default install. I am assuming default includes:
server
pgadmin
psql
QUESTION 1: Are my assumptions on the defaults ABOVE true for Windows 8.0.1?
If not,
what else do I need?

I want to be sure pl/pgsql is included, and want to add fuzzy string match.
QUESTION 2: How do I add these?