Consider adding default Word completion to Ilist/Dlist [Enhancement Request]

[fourjay]

From a lazy usability perspective I'd like Ilist to use <cword> if no argument is given. I'd also like <tab> completion to fill this word, and possibly cycle through other words on the line

[romainl]

Hi! The latter seems to me to be outside of the project's scope but the former is already there with [I and ]I.