New functionality: Tax write-off

It would be worth adding a specific feature to record the write-off of a stock in the process of liquidation. I assume the best way to handle this at present is to 'sell' the shares for $0 but I could not find any help documentation to confirm. Technically however even after the ATO allows them to be written-off, shares are often still owned and attributed on the registry until years later. A dedicated function could allow the written-off shares to remain in the portfolio until they finally die and would help the user know what to do (my first thought had been to try a cost base decrease).