At this time one Joelister account can only support one pair of eBay and Amazon accounts at a time. So in order to sell on multiple regions with multiple eBay-Amazon account pairs, you would need to create separate Joelister accounts.
The good news is that we offer a continuous 50% discount on all non-primary accounts. Your primary account is always your largest account. In order to receive this discount, simply create secondary accounts, subscribe to appropriate plans, and then notify us through support ticket of the creation of these discounted accounts (please include the emails used so we can find the accounts). We will then apply the coupon accordingly.