So, I decided to write a few more bookmarklets to help with some basic web application auditing. here they are:
methodToggle for toggling the method of a form.
noMax for ditching the maxlength restriction on text fields
hidden2text for changing hidden inputs to text inputs. After trying to get this one to work for about an hour I started googling to see if anyone else had done it. Thanks to Jesse from Squarefree.com for this, I modified it slightly so that the text inputs it creates to replace the hidden ones actually submit regularly with the form :)