Can I add form processing step(s) to the Default Unsubscribe URL

Hi,

Does anyone know if it's possible to add form processing steps to the default unsubscribe URL?

The URL we have in our emails looks something like:

http://app.oursite.com/e/u?s=<eloqua type='emailfield' syntax='siteid'/>&elq=<eloqua type='emailfield' syntax='recipientid'/>

Is there an actual form in our 'forms' section of Eloqua where I can simply add Processing Steps?

Thanks in advance,

Kevin

PS the reason I'm asking is because I need to use the 'Post Data to Server' processing step to send our unsubscribes to another system.