This has been a long standing feature request to add a user configurable default status on ticket reply's, open tickets, send mail. Attached is a patch that does the following.
1) It adds a config screen to set-up site wide defaults for reply to a ticket, open ticket, send mail. Defaults to wait for reply the current default.
2) Group wide setting for reply to a ticket. Default to use site wide setting.
3) Added template support for these settings.
4) All added text is translatable.