Simple calculation within number fields (like quickbooks).
Enter 2+2 in the quantity field, hit enter and the Quantity shows 4. Sometimes bills have line items of the similar things which we just lump together thing. Extend the calculation function it so we can enter the total, the quantity and then per item price is calculated.
Yes, 100x yes on this. If numerical fields could support mathematical functions, that would really quicken entries and streamline so many things. Support for the standard functions such as +, -, /, * would be a great feature.
From a developer's perspective, should not be too complicated to implement as it would just be a frontend feature while a numerical input box has focus.