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Interfaces should be minimal (simple as possible), narrow (provide only the functions needed), and non-bypassable. Trust should be minimized. Consider limiting the data that the user can see.
Applications and data viewers may be used to display files developed externally, so in general don't allow them to accept programs (also known as ``scripts'' or ``macros'') unless you're willing to do the extensive work necessary to create a secure sandbox. The most dangerous kind is an auto-executing macro that executes when the application is loaded and/or when the data is initially displayed; from a security point-of-view this is a disaster waiting to happen unless you have extremely strong control over what the macro can do (a ``sandbox''), and past experience has shown that real sandboxes are hard to implement.