Folks. I tackled changing the title of the login successfully. So I imagine that it may be possible to make further customizations.
The code has some downsides. It depends on SS dynamic classes which can change at anytime. So you need to add a routine check of your site to see when things break and fix.
It does require JavaScript to work. The JavaScript can work because the login dialog is added via an iframe on the same domain as your site. So it is possible to cross the document boundary with JavaScript.
I can't say for sure what you want to accomplish can be done but if you are interested I might be able to modify the code to add the ability to include some custom CSS.
Let me know if you are interested.
