WAL on a RAM disk

As part of our application we are running a postgres server on a RAM
disk. All of the data stored in this database is obviously disposable,
and we need to optimize access as much as possible. This is on Solaris
9/intel, postgres 7.4.5. Some things I'm wondering about:

1) is it possible to turn off WAL entirely? If not, what configuration
of WAL/Checkpoint settings would result in minimal WAL activity?

2) Given that the whole database is in memory, does it make sense to set
random_page_cost to a high value...or, um... a low value? (Does it show
that I don't understand this parameter?)

3) Any other settings I should be looking at?

Thanks. I don't know if anybody else has done this, but I'd be
interested to hear about it, if so.

- DAP
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David Parker Tazz Networks (401) 709-5130