I have tried to style the tag with some success. I have been able to style the border, shadow properties, text-align, as well the font (although not using @font-face, but that's another issue). What I havent been able to style is vertical-align:baseline; or padding: 0px;. I took a look through the bbui-0.9.5.css and don't see any overriding styles. If anything I am surprised the border worked.
I am using Dev Alpha A, with 10.0.9.388, and 0.9.5
You can close this. I was able to achieve my desired output using the height of the input.