For consistency, when editing, the 'Cancel' link should really be a button along with the other buttons on the line, since it is an action like the rest of them even if it isn't directly tied to the form itself.
The help link should also probably be removed entirely from at least the default installation, as no help pages actually come with said installation and thus the link doesn't go anywhere. Expecting wikis at this point to write their own editing help pages is also pretty silly, as there tend to already be much more thorough such pages on other wikis such as enwp, meta, and similar, and new projects can merely refer to those instead if needed. For any projects using the WikiEditor extension, though, having a link at all is redundant anyway as the toolbar the extension provides includes a navigable help menu directly in it.
Ignore the other stuff, but the line of buttons would look something like on this: http://commons.wikimedia.org/wiki/File:Enwp_edit_20120917_with_even_less_stuff.png