The next version will be the fix release. There will be no new built-in feature. Our new feature will be available as an add-on. We will launch refund feature for seller. We will launch our next release on the last week of this month. When there is any major feature, we always send the plugin for beta testing. If there is any major change then for sure we will select you as a beta tester.
Sorry, It will not possible. Because if we do that then seller can delete is account anytime without paying payment or deliver a product to customer. There is many negative thing can be happen. If any seller do not want to sell then admin can deactivate his selling.