Would greatly appreciate your votes! I just put up a Pardot idea in the Idea Exchange wishing for completion actions on landing pages. I know this can be accomplished via workarounds (such as form handlers and automation rules), but it would be great to have this as a one-stop-shop solution. 

Would greatly appreciate your help getting this idea some traction:

https://success.salesforce.com/ideaView?id=0873A0000003YiBQAU