I want to be able to add to my list of 'Searches' by incorporating a a search string which will automatically search for an item in Google Scholar instead of on the Web.

In fact, what I actually want is for that search item to be automatically placed in quotes so that I can search for blocks of words.

Is there a possibility of me doing that?

Right click on the address bar and select Edit search engines.
If you set your newly added search as default, you can search by right-clicking selected test using it instead of google.

Many thanks. Will give that a try.