Protected naming style

I have a problem with one of the naming styles in Reshaper. Reshaper has two naming styles for fields (private / non-private).
For private fields I keep a lowercase style (camelCase) of for public fields (not properties) UpperCamelCase (PascalCasing).

The problem I have is that Reshaper doesn't recognize a protected field as private. As a result resharper advises me to use a UpperCamelCase naming style for the field, but that would collide with the associated property. A solution to this would be using a underscore prefix, but that would violate the Microsoft Design Guidelines which discourages the use of underscores, hyphens and other non-alphanumeric characters.

In my book a protected field is still private as it is not accessible from outside a (derived) class.

So can I add protected fields to the 'Instance Fields (private)' naming style or do I have to create a issue for this?