DOCBOOK-APPS: DSSSL customization

[Tim =?iso-8859-15?q?Terleg=E5rd?= <tim@se.linux.org>]

Hi, I've managed to make some customization of my document, like changing 
body and subtitle font and changing the depth of headlines shown in the Toc 
as well as numbering all sections. I did all this by myself  ;-)
But there are a few more settings I wanna do that I can't manage.

1. A headline says "1.1. Introduction" - can I remove the last dot from 
"1.1." ? I don't think it should be there...

2. How can I choose not to have numbers on <sect4> headlines?

3. The subtitle, how can I make it non-bold and change the font size? How can 
I make a linebreak in it?

If you answer this, could you please CC to timte878@student.liu.se, as my 
primary address does not work at the moment.

Thanks,

Tim