This would help testing, but also would be a convenience to the developer. 
I.E., a "Reset Defaults" option for Edit Web Service Attributes. 

It would also help if there were a way to see what all the defaults are 
in the wsit xml file. For example, before you edit any web service attributes, 
FI is on by default, but there is nothing in the wsit xml file to indicate that. 
If you uncheck FI, the xml now contains

   <fi:OptimizedFastInfosetSerialization enabled="false"/>

Afterward if you check it, the value is changed to "true". So 
initially, the absense of the OptimizedFastInfosetSerialization
element means FI is enabled. 

For FI it is easy to see its default setting by looking at the UI, 
but to get a picture of all the defaults, it would be prohibitive 
to explore the whole UI.