In themes like Rubik, the short #description for a form field is turned into a callout box, which appears on hover over the form. When webform puts the whole of
theme('webform_token_help') in the callout box for such themes, it's pretty much unreadable: see attached screenshot.
I appreciate it's easy to dismiss this as a theme-specific issue, but there's also an argument that suggests that field descriptions shouldn't contain so much content anyway, and it might be best putting this as a #markup element elsewhere on the form. Also, it could end up repeating multiple times, leading to hugely inflated markup. Would it be best to just have it once on the admin form, as a footnote?