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To expand upon what Mark said,
The type of functionality you are looking for is custom UI functionality, while we do have an enhancement request in the backlog for this, it is not currently in development.
As a workaround, may I suggest you implement custom 'validation' on the processor (see developers guide). That way the processor won't run with an invalid configuration. And the user will be told what is wrong when they click the 'validate' button during configuration. It is not the most pretty way to get this functionality, but at least you won't have configurations running that are not valid.