Per upstream, this is already available as a config option:
By default, Thunderbird 2.0 forwards a message as attachment, thus you should
see an ".eml" attachment in the upper-right-hand corner of the composition
window. This can be switched to "inline" in the Edit > Preferences >
Composition > General tab, thus allowing you to edit any component of the
message you are forwarding (including the addresses of previous recipients).
Please report any other bugs you may find.
** Changed in: thunderbird (Ubuntu)
Status: New => Invalid
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Forwarded mails should be editable in Thunderbird
https://bugs.launchpad.net/bugs/289681
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