I want the ability to create my own test extensions...like a reusable library of custom coded functions I can use on any test.

I don't want external tests and link them in with "test as step"...I want my own dropdown in the ribbon bar, or put them under "More".

Example:
Assert.IsTrue(ActiveBrowser.Url.Contains("site=cs6"), "Site isn't in the querystring");

I'd like to create a method that's called "ValidateQueryString(string key)"
...then wrap that code into there...then if I ever need to change the logic I'm not having to open 40 tests.

Or whatever right...