Please allow ability to set mail encoding separtely from html/DB enoding

In Japan, it is common practise to set up encoding like this:

DB/HTML > UTF-8
EMail > iso-2022-jp (this is because a large number of Japanese users are still using older mail clients)

Currently, JIRA uses the same encoding setting throughout i.e. the encoding setting (webwork.i18n.encoding in webwork.properties) is shared among different components, e.g. MailSender, TemplateManager, etc. Therefore, in order to meet Japanese requirements, currently the only option is to manually modify the source code of the MailSender class, which obviously does not work for most of our customers.

Could you consider having the option setting in next release of JIRA to allow choosing a mail encoding setting different from the DB/html encoding setting?