It should be possible to clone just (say) trunk, rather than having to clone the full history.
Would like to see this, too. Currently cloning the whole SVN repository fails (probably because be moved trunk/ some time ago as we needed to restart the project, so this was the easiest way to clean things up while keeping history). Only cloning trunk/ would be enough, but hgsubversion seems to not support this. Funny thing is: The clone itself seems to work, but the hg repository is empty afterwards. I think this is, because only trunk/tags/branches are cloned?