Customised <ol> and <ul>

Hi all,

I would like to create a customised order list and unorder list.

1. Create a different indent style for each level. Let say that the <li> doesn't not have any indent, <li> level 2 will indent 5px.
2. Can we change the <ul><li></li></ul> type to other then the standard type. In this case I may want to use a checkbox.

I am using ckeditor 3.x

Thanks All.