Your suggested solution just doesn't help. Because you enforce converting a smaller currency to bigger currency (for ex. THB to SGD, VND to SGD, IDR to SGD), where allow the other way would work magically. 

QBO simply doesn't understand user's pain point and study cases for exchange rate. It's too late for me to migrate to another platform. Have been living with this issue. 

Regarding submitting feedback, I did.

Taking the chance of this post, where another use reports similar issue as mine. I repeat my feedback again. 

I hope this is fixed ASAP.

QBO is not supporting multi-currency well for currencies like VND, THB, IDR, whose value is significantly smaller than SGD/USD/AUD.
I don't have issues with USD, AUD, SGD, GBP, EUR because their currency values are close. FX about 1 plus, 2 plus.

Xero for ex. allows 1 SGD = 17135.4 VND
But QBO forces VND = x SGD with limited spaces for decimal points. which can only record 1VND = 0.0000586SGD - where it should have been recorded as 1VND = 0.000058 569

As a result, 31,991,792 VND - which should be 1,867 SGD - recorded as 1,855.52 SGD and I can't change it.

If QBO like Xero allows 1 SGD = 17135.4 VND then there should be no issue.

Same situation for THB and IDR.

This limitation is really inconvenient because I deal with multiple currencies often. And I keep creating Journal transactions for it to do reconcile.

Thank you.