I was wondering why you haven't done this yourself and sent me a patch. It would only require adding a new module setting, it will not require any schema change.
I can make this enhancement for you as it will only require a few minutes. I will add a module setting BlogUseLinkForHeading with default true and use this to handle the rendering.
Once I have this in svn you will need to add this module setting to the blog manually for exisiting installation, though new installation will have it correctly.
This illustrates what I'm trying to do by adding guids to the modules. In the future I will have a way to easily add new module settings during ugrade where now there is no convenient way to do it so people upgrading will never see this option unless they add it manually.
I should have this in svn by the end of the day.