Pause subscription

This looks like a great plugin. So far I have installed the free version to see if it can do what I need. I have a monthly subscription box. I have 2 questions:

1 – Can the customer and admin pause a subscription? (I do a monthly box except not in January – cos everyone needs a break in January!)

2 – I think I’d need the PRO version for admin to add products to a subscription – so eg I have a greetings card subscription box, Customer might want to add a gift or extra cards for one months box only – can they do that, can admin do that, or both?

3 – if customer/me adds products what’s the easiest way to make sure it doesn’t add a shipping charge?