In Thunderbird's Engimail it is possible to set --no-version: extensions.enigmail.agentAdditionalParam;--no-version This feature is useful for privacy since the GPG headers can determine GPG version, Linux kernel version, and other revealing meta-data. A simple checkbox or ability to add custom parameters to be passed to the GPG binary from the UI will fix this issue.
Just do that in your gpg.conf.