[FEATURE REQUEST] clear the screen

Hello,

'git add -i' is a very useful tool. I would like to be able to clear the
screen everywhere in it (regardless what the prompt is).
In shells like bash or zsh we have the clear command and the Ctrl+l
bind key.

Most of the time I use to use the bind key, but having an entry such as :
9: clear screen
would be useful (for me, at least).

Could it be possible to add both in git ?

-- 
Nicolas Sebrecht