Many of the ex commands are critical to true vi heritage, including :w. From wikipedia's article on ex:

ex was eventually given a screen oriented visual interface (adding to its command line oriented operation), thereby becoming the vi text editor.

We've got a lot of our movement commands, but it would be great to have our :w, :%s, :g.

Most of the movement commands are there, so I'm generally having a good time. Thanks for this package!