BUG #5218: Easy strategic feature requests

The following bug has been logged online:

Bug reference: 5218
Logged by: Russell Wallace
Email address: russell(dot)wallace(at)gmail(dot)com
PostgreSQL version: 8.4.1
Operating system: Windows
Description: Easy strategic feature requests
Details:

(There wasn't a separate form for feature requests, so I'm assuming that
like most projects, this one files them together with bugs, please let me
know if that is not the case.)

Can you make Show Databases, Show Tables and Describe (table) work the way
they do in MySQL? This would make things easier for newbies and would also
make it easier to port code from MySQL; they would only need to be syntax
sugar for the corresponding information schema queries, so it would probably
only take a few lines of code, and would improve PostgreSQL's competitive
position versus MySQL out of all proportion to the apparent significance of
these features.

It would be nice if Use (database) could also be made to work, but I'm
guessing this would not be just a few lines of code. What would be easy and
still useful, however, would be if it could return a specific error message:
"you can't do this in Postgres, you always need to supply a database name on
connection"; again that would make life easier for newbies, and that matters
a lot for competitive advantage.