Rated 4 out of 5 stars

Great idea!

1: image previews for google image search should be larger
2: search for server-path, not only domain:
search in http://cybernetnews.com/cybersearch/
should be possible instead of only

I think this can be done by adding another field "append these words to every search with this keyword".

This review is for a previous version of the add-on (1.0.5). 

Already available

Your second suggestion is already available... in the box where you enter the domain for a search just enter "cybernetnews.com/cybersearch" as the "Website URL".