Preload settings is another new feature, with a syntax that’s documented (unlike job export).
Example Scripts shows how you can change things on the fly before backup, if that will help.
For example DUPLICATI__REMOTEURL can change destination URL based on what script says.
I suspect changing schedule will be harder, but it’s in the job export/import if nowhere else…
You can certainly run Duplicati with your own maintained scheduler, if that fits your use case.
“Export as Command-line” will provide a job’s command line, which you can have scheduled.
Command line also supports parameters-file where you can put options for the scheduler job.
Another new paid feature is the Agent. It’s still in progress, but there’s a little bit about it here:
The Agent package is still a bit new, so at this point it is mostly intended for enterprise-style installations where many machines needs to be configured and managed centrally.