However, since SuperCard allows having cards (i.e. "pages") in windows of arbitrary types, one can easily build one's own dialog that is large enough.
A switch command is available for more readability in complex conditionals, and various types of media can be recorded (e.g. screen grabs of a card, sound and QuickTime movies).
Multiple windows with several styles (modal panel, non-modal, scrolling, resizable..., floating palettes) are also available and focus and activation scope can be modified under full script control.
Also, it seems that over time, a number of XCMDs were simply rolled into the engine as built-in commands, maintaining the not very memorable handler call syntax.
There are also some properties that control general application behaviour that are one-to-one translations of the underlying system APIs, e.g. for using "appearance manager" (the theming engine in Mac OS 9).