Those lines all have classes, so you can add spacing easily. The classes are:
cartline_draftprice - the price line
cartline_instantpricingupdate - the update line
cartline_deleteitem - the remove line
So, you can use something as simple as this in your DirectCSS to add spacing:
.cartline_draftprice, .cartline_instantpricingupdate, .cartline_deleteitem {
padding-bottom: 10px;
}