ClassiPress is not encrypted, so essentially you can make whatever customizations you like in order to suit your needs. You can of course by default add only 2 category types within the theme, and make use of custom fields and forms functionality which will allow you to have a different type of form for each category type, but the overall change of separate home page etc would require modification as you have mentioned. We recommend the use of a
child theme if you are making changes, as this will prevent you from losing all of the changes in the process of an update.
The initial
purchase includes a lifetime license for the theme, but the subscription renewal is specifically for support and theme updates. After the initial 12 months is finished, you have the option as to whether or not you wish to renew the subscription. If you do not, you will no longer have access to the support forums, or be able to download theme updates from your AppThemes customer dashboard. Thanks.