This applies to Invoices as well as Estimates: For line items that have a Quantity but no Unit Price (thus, also no line total), I would like the option to display a blank space instead of 0.00.

I frequently have a line item with a Quantity, Unit Price, and Line Total, where this item represents an assembled product. The following lines are Items and Quantities that are included in the assembled product, but I don't want to show the prices for each of the items included in the assembly. Leaving the prices and line totals blank when the price/total is 0.00 reduces the clutter and make the estimates/invoices more legible.