The value in the database that controsl this seems to be:
wp_options > woocommerce_enable_coupons (\plugins\woocommerce\includes\admin\settings\class-wc-settings-general.php: 197)
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Here you go: hidden link
It's totally possible and it's not a hack or anything, it's a good way to achieve what you wanted and this might be applicable to other plugins and other theme options as well.