Autoblog - Additional content placeholders

The add-on "Append text to post" already has predefined placeholders but they don't fulfill all our needs. We'd love to expand its features and available placeholders to be used.

For example:

%blogtitle%
%pagename%
%categoryname%
%subcategoryname%

Or if we had a place we could insert our own placeholders that could be amazing, then we could do several like this:

%greeting% - Good Day! or Hello! or Great to see you back again @ %blogtitle% in our %categoryname%!

%conclusion% - same idea as greeting

Basically, if we had a way to define our own spun content we could add unique introductions to every new post.