I'm glad your issue is solved.
You're correct; you cannot use a coded step for the qualifying verification in a Test Studio If/Else logical step. You can, however, use the following lines in a coded step to execute a sub-test based on browser type:
(ActiveBrowser.BrowserType == BrowserType.InternetExplorer)
(ActiveBrowser.BrowserType == BrowserType.FireFox)
"Unknown browser type"
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