Feature Request: Smaller decimals for crypto-currencies

Hello,

I'm paying a lot of my VPN subscriptions with Bitcoins. They cost me anything from 0.0008 to 0.0013 BTC, but I can't enter those values in Wallos, since the minimum amount accepted for any currency is 0.01.

As of now, I just multiple all my values by 10000 to be able to enter them, but it's clearly sub-optimal. Would it be possible to make it so smaller values can be used ? Or maybe it's already possible and I just didn't find out.

Many thanks.