I think spot FX is in the roadmap, but I would like to suggest adding a feature to hedge the exchange rate.
Say I want to buy USD bonds (in the future), but I don’t want to be exposed to USD/GBP exchange rate. WA could offer me a functionality to hedge the rate for the duration of the bond. Maybe for the interest as well (?), but as least for the principal. Or simply allow me to hedge a fixed amount (that I had converted from GBP to USD).
It would bring a bit more revenue to WA and would make a wider range of bonds available to users. Including in currencies other than GBP/EUR/USD (longer term).