How can we improve WHMCS?

As a business owner in the EU, I must submit a VAT MOSS return must be in EUR. I currently have USD as my base currency.

It would be beneficial for completing VAT MOSS filings, if WHMCS could track the exchange rates between these two currencies at the time of invoice generation, and then convert the VAT liabilities into either currency as needed on the VAT MOSS report.

Currently the VAT liability is divided by the client's currency. Filing would be made easier if is could be converted to either currency (EUR in this example).