Decimal Places

I would like to request that when a quote, sales order or invoice is entered that if the list price is set to 4,5 or 6 decimal places to the right that when the quote, sales order or invoice reflects this in the list amount. The calculation for total is correct, but the system rounds-up the value in list price and it is confusing to our clients. If they perform a quick calculation on the qty X list price ( once rounded up), it does not match the total for that line item. I guess a better question is why would you let me enter up to XXXX number of decimals to the right but not display it when the quote is turned into a pdf