The placebo fix is: when showing your prices with whatever you're using, don't make the prices determined by paypal, rather the IPB application itself. However, because PayPal doesn't support decimal via API means that it won't support it at all, period. The issue here is that PayPal doesn't support decimal because the amount in decimal is so minimal compared to the US Dollar that they lose money with the feature enabled therefore disable it completely for those currencies. That being said, if you really want it, it's not something anyone with IPB knowledge can help you with, but speaking with PayPal dev support would, however, they would probably tell you the same thing. Bypassing these kind of things could get you banned from the API, but some people do it anyways, I haven't seen anyone bypass the decimal issue as they just conformed to not using decimals.