We want to use VisualCron as job-engine for Reporting Service reports but lacks the possibility

The "target" tab only supports saving to file and there is no way to set a job-unique filename since using a pre-task of setting a varaible and filemask like *_{USERVAR(filename)}.pdf generates errors: "Exception in Task: The given path's format is not supported."

Otherwise we could save a file in temp-folder and then email with job-variable name but this is a no-go

Any ideas?