I’m planning to change DONATION to use 5-digit receipt numbers, so that for instance 2009 receipts will start at 2009-00001 rather than the current 2009-0001 (only 4 digits). This will allow larger organizations to use it without worrying that they might run out of receipt numbers, and allow me to stop saying that DONATION is most recommended for use by organizations with under 2,000 donors.
Of course, larger organizations may still want more fundraising features, and I will continue to say that.
My question is this: Do I need to provide an option to stay with 4-digit receipt numbers, for any organizations that think it will be disconcerting to their donors if they observe a change? Or should I just not worry about that, because really 00001 should be considered to be the same number as 0001?