DervishD wrote:
> > Incidentally, a wrapper function to delete the word under the cursor
> > is a little tricky to write.
> 
>     Writing zle widgets is tricky.

If you have 4.1, much of the work is done for you; see the description
of match-words-by-style in the zshcontrib manual.  Here's a function
using it (which consequently won't work in 4.0) which can go into the
distribution when the glitches have been ironed out.

A side effect is that you can decide using styles what constitutes a
word, as described in the same section of the manual.