maybe have autocomplete of wikiwords?

[cdent]

It's been done to a moderate degree in one of the editors that was
created for tiddlyspace, http://medit.tiddlyspace.com/edit , but a)
only with the [[ trigger and the completion is based on the letter
or letters anywhere in the title, not initial matches, so it's not
great.

I could, however, steal it to make it happen in the editor for Tank
and make it a bit better. The issue is that it can get a bit
expensive to do the lookups on each keypress. If, however, you sent
a prebuilt trie of all the titles in the current tank and only start
the autocomplete interface after either a [[ or cap that is in the
trie it might be workable.