Decimal Points for Cost Basis Calculation

When I click on "Edit Lot" to enter the purchase price of the stock that I purchased, the calculation of the Total Cost Base is done based on just two decimal points.  This results in a small difference in the overall Profit / (Loss) calculation, which, while not material, is marginally annoying.  SUGGESTION:  it should be possible for the user to add up to say 8 (?) decimal points so that the cost basis is 100% accurate and the resulting profit / (loss) is accurately calculated also.