I think it would be really cool if there was a way to calculate how much of a specific denomination(if it's not demonetized) you have and convert it to your home currency.
Example:
If I have (4) 10 peso coins from the Dominican Republic, I want to know how much that is in USD. Instead of having to multiply it by hand, or google it, it would be nice to have the conversion handy for when you are trying to value your collection. ( I don't know if this is making any sense