Change the length of a Manual Check Number

Hi there,

Is it possible to change the allowable length of a manual check number?  I want to use the format VMMDDYY (where V is the vendor initial), as I write manual checks for several vendors who I pay by credit card or wire, then record in MAS via manual check.  Since I'm stuck with only 6 characters, once it gets towards the end of the year, I have to sacrifice a digit, which can cause confusion with years' past manual checks.

I've looked around the Settings area, but can't find anything.

Thanks!