You don't need git to accomplish this. Creative use of a bash function will do the trick just fine. If you don't care about messages, just set a default one and forget it.
function gitcom() {
git commit -m "my default commit message"
}
If you were feeling really adventurous you could add, commit and push with one command
function gitzap() {
git add . && git commit -m "whatevs" && git push $1 $2
}
Which you would then run as
gitzap origin master
You could even get deeper and use parse_git_branch to save yourself some keystrokes there, or set a common default of "origin" and "master".