@LarsMartin, thanks for the suggestion. We have actually heard this a few times, but would love some additional details to gain an understanding of the recommendation. We have five classifications of checks:
.NET code (plug-ins or workflow activities)
App checker for embedded canvas apps
Flow checker for embedded Flow definitions
Which are you looking to add? Can you provide some concrete examples? These would be extremely helpful. I'm wondering if we could provide you with some "parameterized" or PowerApps formula based approach to adding checks, which would make things much easier for you to author rules. Also, any way that you could provide a little more detail on the value that it would add to you?