In the Hungarian sql-ledger fork there is a good small script to improve date input, thanks to tavugyvitel.hu (József Kabai).
It is working like this: you can write this to the field: 0513 and jump to the next input, the script automatically change the 0513 to 2013-05-13 (or the default date format).
This kind of input handling gives quicker data entering.
Check it here in action: http://www.youtube.com/watch?v=B1g-3o7a6x8
My opinion, regarding the date entries, it is much quicker and more error proof than the default.
What do you think?