With a configuration such as:
; configure storage options [storage] min = 2048 max = 10240 unit = 1024 price = 2 [option "quota"] accounttype = individual,organization,organization-user ldap_attrib = "mailquota" unit = %(storage.unit) value = %(storage.unit) free_units = 2 price = 2
It is is expected all users end up with a quota set to 2048, however it ends up being tracked as 1024.