Allow editing of Operation field without removing Value contents in keyword tests

For example, if I want to change 

Item                   Operation      Value

myfieldname      SetText         Project.Variables.fieldtext

to

Item                   Operation      Value

myfieldname      Keys              Project.Variables.fieldtext

I can change SetText to Keys from the dropdown box, but then the Value field is cleared out and I have to go through the process of selecting Project.Variables.fieldtext from the On-Screen Action lookups all over again.  

I'm guessing that it has something to do with not being able to verify the Value contents, but if I am making a quick change from the editor drop-down, then I should know what that Value is already and I would rather save the time in the replacing and take what I think is a low risk of encountering a mismatch.