A recent change to Thunderbird has set template mails to open in 'view'. This ruins the workflow of people who have setup templates to be used as is and prefer them to open in edit mode so they can be used right away.
It's not a huge deal to incorporate Ctrl+E into the process before applying a sender email and hitting send/send later but it's an unnecessary and fruitless change.
The option to select the 'mode' in which templates (and all mails) can be opened would be a great addition.