Params support for TestCaseSource will be added in http://github.com/nunit/nunit/pull/5057
The NUnit1029 rule will need to be relaxed to not alert when a method has only a params arg. See https://github.com/nunit/nunit/blob/04461658b1e5c9a16091c2a03d63aba25aba6e95/src/NUnitFramework/tests/Attributes/TestCaseSourceTests.cs#L406 for more