Specifying categories for posts from weblogger

After all it is possible to specify categories for the blogs posted
from the weblogger mode in emacs. All you have to add is to add the
"Keywords" section to the header and specify the categories as comma
separated values. The only limitation is that, you cannot add any
new categories using weblogger.

If the header that you get is something like this,

Subject:
Newsgroup:
--text follows this line--

Add the "Keywords:" header and specify the existing categories,
something like,

Subject:
Newsgroup:
Keywords:
--text follows this line--

Now the only feature that is needed to make the configuration complete
is adding tags. Searching for ways to add that.