The auto-fixing of some CodeCop rules are a great idea!
I just enabled the useful initiative BusinessCentral.LinterCop and of course a lot of new warnings appeared! :)
Some of the warnings have a very distinct solution, that could be a perfect fit for your Fix Cop Warnings feature.
Candidates at a first glance:
A list of all available rules are found at https://github.com/StefanMaron/BusinessCentral.LinterCop#rules