Dani commented on Shopify RMA - Integrated Returns & Exchanges

Hi everyone, hoping someone may have some info on the Shopify RMA app, I have emailed the developer but received no response, may be a bad sign but I thought I may just ask the same questions here and hopefully get a response.
One thing I am a little unsure of is are we able to set up only certain products to be returned and/or exchanged. We are a clothing retailer and do not allow certain items to be returned or exchanged such as bras and undies due to hygiene reasons. But saying that if by the rare chance a wrong size or faulty item was sent we would then of course allow for a return or exchange.
So basically we do no refunds unless there is a stock error and an item cannot be fulfilled but instead offer store credits for returns.
Does this then allow for different rules, such as if we are at fault the customer knows we will pay for any shipping costs incurred and if they simply want to return an item they are responsible for shipping.