Hi zcamine, glad you like the plugin.
1) This is so that if you use a background image it fills the full window. As you’re not using a background image if you add:
body.login { overflow: auto!important; }
to the custom css field then it should bring the scrollbar back for you.
2) This is because WordPress resizes the image using the css background-size option instead of using a standard image in html. Best thing to do here is to resize the image offline and then when you upload it then it will be the correct size and should look good in IE. So the best image size to use for your logo is 274px width, 274px height.
Hope that helps.
