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Implement functionality for the basic conversions like cm to inch, Fahrenheit to Celsius, gallons to liters etc
In a time of smartphones where conversions apps are everywhere, it can't be that for converting basics we need to look up elsewhere the exact ratio and then write code (how simple it even might be) to do a basic conversion. Please note that all of Europe except the UK and Ireland, and most of Asia do NOT use what you are used to in the US reg. sizes, volumes, temperature etc.
Simple to make functionality but saves everybody a lot of time.
A more complicated issue is time conversion and DST. But I think an internationally widely used package like FMP can not do without any functionality for that. Helpful might be this: Time zone - Wikipedia , which holds a separate section about programming languages and time zones.
Anybody working in international trade, finance, science etc has got to do with time-zones.