Cloudprint is already there wink wink
How To Install and Configure OpenVPN On Your DD-WRT Router
https://dietpi.com/forum/t/resolved-execute-code-at-startup-automatically/92/1
I think you can use dietpi-services to disable automatic startup
As for services…I think there is a discussion here
https://dietpi.com/forum/t/dietpi-services-vs-systemd-vs-init/2769/1
dietpi-launcher has alot of neat things you can do…I think one of them is to disable autostart apps that were installed/controlled by dietpi scripting rather than systemd