FYI
alteredCart's Cash Rewards and reBOOT v3 work really well together. Only had to tweak the CSS a few times and edit the code added to service_css.tpl to use "load_defer".
Code:
{*** Cash Rewards :: alteredcart.com ***}
{if $active_modules.Cash_Rewards}
{*<link rel="stylesheet" type="text/css" href="{$SkinDir}/modules/Cash_Rewards/cash-rewards.css" />*}
{load_defer file="modules/Cash_Rewards/cash-rewards.css" type="css"}
{/if}
{*** Cash Rewards :: alteredcart.com ***}