I should add that this is most useful for fields that accept multiple values (using checkboxes, possibly combined with radiobuttons and dropdowns), but can also be helpful for a field that accepts a single value (using only a radiobutton or dropdown) if many common values are known, but not all values are known.

For example, for a field that takes the name of a popular 1980's musician, in might be easy to guess Michael Jackson should be included in the field targeting, but not so easy to guess Yngwie Malmsteen, who would have to be entered manually.

I should also mention that the CharInsert extension does not work:

http://www.mediawiki.org/wiki/Extension:CharInsert

http://www.mediawiki.org/wiki/Extension_talk:Semantic_Forms#Char_Insert_Not_Working

I am guessing it is because CharInsert does not known which field to target. The enhancement report may provide a mechanism that can be used to support extensions like CharInsert.

(In reply to comment #2)

Re: the CharInsert extension. SF now supports WikiEditor, which also allows for a customisable toolbar: www.mediawiki.org/wiki/Extension:WikiEditor/Toolbar_customization. On the other hand, it is also rather burdensome to use and far from layperson-proof, so support for CharInsert is still desriable if it can be managed.