<p>Is there any way to automatically rename accessor/mutator when a variable they get/set gets refactored -> renamed (Eclipse 3.4)?</p>

1 - When you select Refactor->Rename on a variable, Eclipse prompts you to enter the new name in an "in-line" box. Directly below it, there is a help message and next to it a small icon (an arrow going down).Click on that arrow and then select "Open Rename Dialog". A new pop-up appears with the checkboxes you need.
2 - Alternatively, select the variable you want to change and press
twice
Alt+Shift+R. Again check the getter/setter checkboxes.