It's basically already setup as a table. Add as many columns as you like. Note the column size total should not surpass 12 if you want it to display all on 1 line. For example column size of 6 + 6, 1 x12, etc.. To add borders you can use CSS that specifically targets your userlist so you can have table borders and it'll look just like a table. Example CSS as follows.
Code:
.cbUserListT_# .cbUserListHeader {
background-color: #f5f5f5;
border: 2px solid #dddddd;
}
.cbUserListT_# .cbUserListRow {
border-left: 1px solid #dddddd;
border-right: 1px solid #dddddd;
}
.cbUserListT_# .cbUserListRowColumn {
display: table-cell;
height: 100%;
float: none;
}
.cbUserListT_# .cbUserListRowColumn + .cbUserListRowColumn {
border-left: 1px solid #dddddd;
}
Replace # with the actual id of your userlist. Your userlist should then display like a table.