Dear,

For first: plz go to modules/snsavaztheme/snsavaztheme.php
find and change
$category_products = $category->getProducts($this->context->language->id, 1, 100); /* 100 products max. */

For second: plz go to modules\snsavaztheme\views\templates\hook\footerproduct.tpl
find and chage
$('#sns_productspecials div.products-grid').owlCarousel({
to

				$('#sns_productspecials div.products-grid').owlCarousel({
					scrollPerPage: true,

Best Regards!