I also would like to add my request to remove accepted by and accepted date from the forms.  Under content, you have several check boxes that allow you to pick what you want to see.  It would seem pretty simple to add this to the list of selected/un-selected items.

Another thing I would like to eliminate is the "T" after every amount on the quote designating it's taxable.  The bottom of the estimate has the sales tax, this is enough, I don't need my customers to see which items on the quote are taxable or not, because in 99% of cases, all items are taxable or not.

This article starts out by saying you can upload docx custom templates, but when you click on the link, it just brings you to instructions for QBO customization of existing forms.

Lastly, I would really appreciate the purchase order and packing slip forms to be included in customization, so all the forms we use can have a similar look.