Thanks for the nice feedback. Concerning the name I am not sure what would be best. I called it disclaimer because it could be used for that while all other names I came up with didn't fit well.

"Comment warning" does not fit the bill because it is not just specific to comments. I decided to simply call it warning. Currently it is for adding warnings to forms, but we could also extend it to allow for adding warnings to other elements.

Is there a way to enable PHP error messages from Drupal. I looked at the Devel module but haven't found that option. What I would like is to only have these errors as user 1 (or for specific roles). That would help debug modules/sites as a group without necessarily impacting normal users.

For the hook_help() function using more than one t(). I thought it was nicer if the translation people would not see the HTML tags. It would also mean that modifying a single paragraph would not render the complete text useless. Is there a guide about best practices for this ?

Thanks again for your feedback. I will rename the module when I do the next batch of updates. :-)