Hi,
Yes, it is possible to fix the direction and the indenting with the following custom CSS:
[html].asp_option .label {
text-align: right !important;
}
.asp_option_cat_level-0 .label {
font-weight: bold !important;
}
fieldset .asp_option_cat_level-1,
fieldset .asp_option_cat_level-1 {
margin-right: 12px !important;
margin-left: 0;
}
fieldset .asp_option_cat_level-2,
fieldset .asp_option_cat_level-2 {
margin-right: 24px !important;
margin-left: 0;
}
fieldset .asp_option_cat_level-3,
fieldset .asp_option_cat_level-3 {
margin-right: 36px !important;
margin-left: 0;
}[/html]
It will look like this: http://i.imgur.com/JI7gZVp.png
Separating them into columns is however not possible, it only works for items within separate taxonomies. (tags, categories, product categories etc..)