Feature request: ctrl-a, ctrl-e, ctrl-w, ctrl-u

[macgyver]

There are some common commands in bash and zsh that would be nice additions, e.g.
ctrl-a: move cursor to beginning of prompt
ctrl-e: move cursor to end of prompt
ctrl-w: delete the word immediately preceding the cursor
ctrl-u: delete the entire line to the left of the cursor

There are many others, but these are the ones I'm familiar with.. one wrinkle is that I think users can customize the shortcuts to access these commands :\