Remove whole reformatting after change format of individual citation

At the moment if you say remove the authors name from citation, the whole document reformats and it can take a long time. Can this be removed when the automatic reformating is not ticked? 

If you have CWYW off (instant formatting) and have converted the document to unformatted citations – so you are inserting the temporary citations {Author, Year #1234}, you can delete the authors name {, Year #1234} and, once formatted, the author will  be omitted from the citation.  If you prefer the Author (Year),  style, it is a more complicated manual fix, {Author, 1991 #1234@@author-year}  - and you can create a shortcut or autocorrect to accomplish this, although I find then you usually need to remove a space, so a macro may need to be created to finesse it.