It says:
This plugin creates a new blog
which is not what I want to do.
The description does not say anything about posting to the main blog. It makes a completely new separate blog and sends everything to that, which is utterly useless.
If that is not what it does then that description is apalling and needs changing to reflect what it actually does.
Also this:
For performance reasons the number of posts is limited to a user configurable amount
Is less than useful, unless it can be set to infinite.