Hi Malte,
I'm sure this is a good solution when you have one instance of lars-blogger wich serves the news in the website's front page. However, I don't know it's the best interface when you have blogs in .LRN. We already have the dotlrn-xowiki package, wich works very well as I can see, but it's suposed to be an Wiki. So, in my environment users access Xowiki for documentation and lars-blogger for news. If I moved the news for Xowiki, it would not be clear to the users when they are posting news or contributing with the documentation.
There's another issue. How would I deal with community creation? When I create a community and put the lars-blogger inside it, the news space is ready to post. If I moved them to Xowiki, I would have to create a weblog portlet manually and put it int hte community's front page, what can cause me a lot of extra work that I don't want to have.
Thinking about that, I can't see a solution other than change the lars-blogger datamodel.