Differentiate between button types

Differentiate between button types

I am a new and enthusiastic user of jQuery and the jQuery UI.

I have two questions regarding the UI.

When I use a jQuery UI theme to style form buttons like checkboxes, radio buttons and submit buttons, they all look the same. Wouldn't it make UI sense to somehow differentiate between a radio button and a submit button, since they do very different things?

Am I the only one that finds the buttons quite "fat"? I haven't found a way to reduce the padding in the design of the buttons via ThemeRoller.

Thank you, and I apologize for these newbie questions.

Francis.