First of all, a 1000k watt thank you for bringing up such nice and light weight php CMS Framework 👍 which is working fine here in php7, as well.
I think, it would be better to add functionality to define/develop multiple websites under a single install like in the http://werc.cat-v.org/; custom config, css, images, templates, scripts and static pages etc. are definable under every site/example.com/ so that a user copies files from original/main framework and customizes it for particular site; installed versions are used as default, otherwise.