Name changed so as not to be identified 
Typed out a long post and then though sod it get to the point - would you tell your employer during appraisal that you are looking for a new job because you are not happy with the duties being given - in the hope that they would stop giving you these duties. Or would you just hand notice in when a new job is found and not mention leaving to your employer in the review?
I really don't want to leave but my employer is continually expecting me to do tasks that I don't think I signed up for as part of my role. I've mentioned it a few times in quarterly reviews and they have just brushed it off.
They do value me as an employee so i'm not sure if they would change their expectations if they thought I would leave or if I would be shooting myself in the foot by more or less threatening to leave.
Any advice appreciated 