Add "Display in following currency" selector for widgets
In case when there are several currencies, but we still have no ability to change base currency - it would be helpful to display information in widgets with selected currency.
In my case I moved from Belarus to Poland but all my widgets and statistics in non-relevant currency.
I know that add ability to change base currency is a BIG deal, so adding one more selector when we configure widgets looks reasonable.
In my suggestion widget is a representation of data in some way: we get data, perform some calculations and then display. Add one more step to calculating to convert from base currency to selected one doesn't look like a big change.