1. An external system for communicating with an implantable cardioverter defibrillator (ICD), the ICD having a plurality of detection enhancement modules configured to perform detection enhancements being algorithms for detecting and analyzing indications of type of tachyarrhythmia, the external system comprising: a user interface configured to present a plurality of available classification modes and receive a user selection of a classification mode from the plurality of available classification modes, the available classification modes each specifying whether each detection enhancement module of the plurality of detection enhancement modules, including a morphology analyzer configured to analyze a correlation between a tachyarrhythmic waveform of a cardiac signal sensed during a detected tachyarrhythmia episode and a template waveform, is to be activated or deactivated according to a pre-selected set of none, one, or more of the detection enhancements.