I'm not sure what you mean by it can only track long values? TrackFeatureValue is perhaps what you need? You can track features in three ways: use, value and timing.
Feature use tracks textual values grouped under a category: TrackFeature("category.value").
Feature value tracks numerical values: TrackFeatureValue("Name", value);
Feature timing measures process times: TrackFeatureStart("Name")/TrackFeatureStop("Name")
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