If you can hold foreign currencies in your account, e.g. USD, and use that money to buy and sell US shares then this would get around the exchange fees.
Just did a quick search and I didn’t see anything regarding plans to add other currencies. I̶ ̶h̶a̶v̶e̶ ̶r̶e̶a̶d̶ ̶a̶ ̶f̶e̶w̶ ̶c̶o̶m̶m̶e̶n̶t̶s̶ ̶f̶r̶o̶m̶ ̶F̶r̶e̶e̶t̶r̶a̶d̶e̶ ̶s̶t̶a̶f̶f̶ ̶h̶o̶w̶e̶v̶e̶r̶ ̶s̶a̶y̶i̶n̶g̶ ̶t̶h̶e̶ ̶F̶X̶ ̶f̶e̶e̶ ̶i̶s̶ ̶h̶o̶w̶ ̶t̶h̶e̶y̶ ̶m̶a̶k̶e̶ ̶t̶h̶e̶i̶r̶ ̶m̶o̶n̶e̶y̶,̶ ̶s̶o̶ ̶t̶h̶i̶s̶ ̶m̶a̶y̶ ̶b̶e̶ ̶u̶n̶l̶i̶k̶e̶l̶y̶ ̶t̶o̶ ̶c̶h̶a̶n̶g̶e̶.̶
Edit: I’ve striked through the above text, @Rat_au_van has corrected me below. This article states that Freetrade do not make money on the 0.45% currency exchange fee, this is the rate that they get, which they pass on to users: Freetrade Invest Hub