Change virtuemart conversions

VM does currency conversions for Base price, final price and override for a product. Because the conversion rate changes all the time I cannot have a clean price. For example, have Danish currency default in VM, and then have a price in US$ 59, with a clean discount US$ 10 so the final sales price would be US$ 49. There would always be some currency conversion happening so the discount would be 9.67 and final sales price US$49.33. I don’t want that. I want VM to use the Cost price currency and not convert. Only if currency not set for the product it is allowed to convert.