Now I found a working configuration for w.bloggar posting to dasBlog 1.5.xxx inclusive title and category (you have to correct Host and Page path):

And these are the (more important) custom settings:

The category dropdown also may have Categories metaWeblog API - single selected, take what you want (how do I select multiple categories in w.bloggar?).
BTW: what are Templates for (in relation to dasBlog)?