Query on git commit amend

Hello,

Suppose i want to add few new changes to my last commit (HEAD).
The way i do it is
$ git add all_changed_files
$ git commit --amend

OR
$ git commit --amend -a

With both these ways, i get a screen to edit the message too.

I want to know if there is a way to skip this screen.

i.e.
$ git commit --amend -a -some_other_option

which simply adds new changes to existing commit, without asking to change
message.

If there is no such way, then can we add a patch for this, if it looks a valid
case.

-- 
viresh