When I add a word that does not exist in your dictionary, it might be good if this word was automatically sent to you to be reviewed and possibly added to your list. Alternatively, let us do this manually on your site.
Visual Assist uses an open-source dictionary (the same that is used by openoffice.org) so it should be regularly updated. Such an organized contribution system should take place on this site.
There are some words and abbreviations which are commonly used in code that are not generally applicable to wide-audience dictionaries - we do have a small list of them. To have those types of strings considered, you can use the manual approach (the contact form): http://www.wholetomato.com/support/contact.asp