There is yet another modification that might be of interest:

If you have a MAX232 on your board, wired as in the BootLoader example, there is one spare driver.

If there is any device on your board that requires a negative (supply) Voltage
(i.e. LCDs with extended temperature range need a negative "contrast" voltage)

Pull T2IN (Pin10) of the MAX232 HIGH and T2OUT (Pin7) will provide that negative voltage.

rgds