PayPal is only available for withdrawals, because a PP transaction can be reverted and their TOS are not very Bitcoin friendly.
Even though generally funds can be "reverted" and the "TOS are not very Bitcoin friendly" the is a material difference between sending funds to fund an account (of any type) and purchasing an item.
Paypal's 'Mass payment' option is not an disputable item. CT should look into that as a paypal funding option
I'm not sure about that. If you were to do the mass payment using a credit card, then have your CC issue a charge-back.