Filter by parameter defined in API which are not object property

Hello,

We have a custom filter defined on our API, the parameter name is modificationRestrict and not rely on a property. I see that the code hide this filter because the schemaAnalyser doesn't find it in the properties list. I don't understand why this choice has been made, but it's seems this restrict to much the admin.

As I don't know if this is a bug or a design choice and consequently a feature request, I send a support question.