Deb can be downloaded from package-view: http://maemo.org/packages/view/qbw-harmattan-clock/
But I think using repository is the most easiest way.

My third test was multidesktop releasing (=widget goes to the every desktop): http://talk.maemo.org/showthread.php?p=1182504

On Debian there is goal to not ask anything during installation and I think Maemo should use the same approach. So, package maker chooses some sane defaults and then user has two options:
a) fetch the sourcepackage + modify + repack + install
or
b) install it as-it + tune it via configuration files and tools

And there will be values that package maker must choose and they will not fit for every user (If I read http://wiki.maemo.org/Queen_BeeCon_W...ipts_please.3F correctly, this is one reason nobody have done this before):
*coordinates for widget
*single desktop (which one?) / every desktop
*(values for widget itself, e.g. 12h/24h clock)


I'm not yet very good for making (or tune) widgets, but after installing you can get widget's settings visible and then you can find Command (under Advanced) which it is using.
Something like this:
http://wiki.maemo.org/Queen_BeeCon_W...ings_and_Tools

Search %I and change it to the %H and remove %p entirely.

(This moment I can't give better answer)