[PhilJ]

@Pinakin...

1) In skin/reboot/customer/home.tpl

Before...

</head>

Insert...

<script>var $ccatid;{if $current_category.categoryid}$ccatid={$current_category.categoryid};{/if}</script>

2) In skin/reboot/js/custom/reboot_products.js

After...

        setGrid(); // USAGE: setGrid(); or setRows(); or setList();

    }

Insert...

    // Set Products Layout to 'List' for Specific Categories
    //------------------------------------------

    if ($ccatid){
        var prev_products_layout = products_layout;
        console.log("Current Layout: "+prev_products_layout);
        console.log("Category ID: "+$cat);
        if ($ccatid == 7 || $ccatid == 999999999){
            $('.products-container .item').removeClass('col-xs-12 col-sm-6 col-md-4 col-lg-4 col-lg-12 grid-view rows-view list-view').addClass('col-lg-12 list-view');
            $('button.switcher').removeClass(selectedClass);
            $('button.switch_layout_list').addClass(selectedClass);
        } else {
            if (prev_products_layout == 'Grid') {
                setGrid();
            } else if (prev_products_layout == 'Rows') {
                setRows();
            } else if (prev_products_layout == 'List') {
                setList();
            }
        }
    }

Replace the numbers in red with the category ID(s).