git send-email should always ask for in-reply-to

Hi,

i currently have the problem that, if I set sendemail.from and sendemail.to in git-config (from global and to project-specific but that doesn't matter) git send-email doesn't ask me for a in-reply-to message-ID. I set these 2 config options for convenience. But i also want to specify a message-id after calling git send-email to get a proper thread on the mailing list. I dived into git-send-email.perl and found $prompting which is only != 0 if $sender or @to isn't already set (lines 672-685). On line 706-709 there are some check whether $initial_reply_to should be asked or not. If $prompting is sitll 0 $initial_reply_to will not be asked. In my opinion git send-email should always ask for in-reply-to. I know there is --in-reply-to option but this keeps me from using the git command from shell history as i have to modify the parameter each time.

What do you think about it? Best regards Alexander