I'm so glad that you support the UK! But it would be lovely to set the default currency as £ (or €) rather than $.
This is a popular request. It was deliberate not to offer multiple currency support. We believe having a unified payment flow will go a long way in improving conversions. Higher conversions = happy creators :) However, we're currently looking into paying creators in their currencies, which will solve half the problem (+ a lot more payment options like Apple Pay, Android Pay, Bitcoin, etc.)
Because you realise that currency conversion is a hassle for your (primarily USA-based) users.
Well, guess what! It's a hassle for the majority of the world who don't use the greenback. I don't intuitively know what today's exchange rate is. I suspect you don't either.
Ideally, you'd geo-detect the user and offer them a currency suitable to their location. If that's not possible, let creators choose their own currency.
If you think I'm making a fuss over nothing, listen to some UK based podcasts. They all end with the hosts asking for a Patreon contribution - and then apologising that it's only available in dollars.