Can I restrict a rich text field to only allow bold and italic?

Hi there,

I've created a letterhead template in LiveCycle ES4 and I've created a flowable rich text field as the main body text. However, I'd like to restrict any rich text edits to bold and italic, while maintaining the embedded font formatting.

Is there a way to do this? The options seem to be between plain text without any formatting, and rich text which allows for more formatting than we'd like.

Thanks,

Ari