Referral ID causing illegal file type errors

Hi Guys,

Our marketing team is paired with some partners that require things such as &id=xyz.abc in the url. These values are unique and never. eg, for another referral, it may be &id=qaz.wsx. The issue here is that since these IDs are passed in the URL, they are blocked due to being identified as an illegal file type. I there some way to allow these that is supported in the GUI? I have been using an iRule that will unblock once blocked however that is not ideal as it has some limitations. The business is prepared to use the unblocking iRule due to it's limitations.

Thank you