No way - form controls in canvas is not going to happen. You have no idea how much work actually goes in to a normal form control: support for every language in the world, support for every keyboard type and input method, focus, tab indexing, spell check, writing direction, clipboard, undo/redo, accessibility (e.g. ability for screen readers to find and read out contents), system-style appearance, etc. So you're asking for all of that to be reimplemented, bug-free and well-tested as the browser/OS equivalents, for what? To make a less recognisable and less usable text input? Or so you can partially obscure it with a sprite? Why would you want to do that anyway?
Besides, you can do a lot to style the text box already with the "set CSS style" action, which already supports a lot of what that "Advanced Textbox" plugin says it can do. For example set CSS "background" to "transparent" and you have a transparent background. Set "border" to "2px solid green" and you have a 2px green border. Set "border" to "none" and then it has no border at all. Combine that with a transparent background, then put something like a 9-patch under it, and then you have the best of both worlds - a completely custom appearance with a fully-featured browser-grade input control.