I like StyleCop's static code analysis and rules enforcement. However, it is severely lacking in several key departments.
Is there such a commercial product out there?
Adding rules is, or is going to be, officially supported:
As promised, we will also be releasing SDK documentation for StyleCop explaining how to author custom rules and how to integrate the tool into custom build environments. The SDK documentation is currently under final review and we hope to release it very soon. -- JasonAll
In terms of our "in-house" style, I got pretty close by disabling a handful of StyleCop rules:
You can do this globally by modifying the Settings.StyleCop file in the installation directory, though I've taken the approach of putting one at the root of our source tree in each project.
The end effect is much what we want. There are a handful of "in-house" choices that would be nice to flag, but even without them StyleCop is delivering a lot of value for us.