Why pg_hba.conf ?

Hello!
I've been using PostgreSQL for about 2 years now.... and I really like it...

But the annoying thing is that, to allow connection for a new host/user, I
have to manually edit the "pg_hba.conf" file.
Wouldn't it be better/easier if the information about users/host are kept in
a PostgreSQL DB instead?
Keeping all these information in a PostgreSQL database would ease DB
administration through usage of SQL statements only.

BTW: Perhaps,it's one of the reasons why most control panels for web hosting
companies support MySQL only and just ignore PostgreSQL?

Thanks.

Have a nice weekend!

Arcadius Ahouansou.