We don't currently have a release date for that functionality, it is just something that is in the medium-term pipeline.
Where a payroll has directors only (quite common with quarterly payrolls) you can get the same effect by running a monthly payroll, and skipping past the months that you don't need (ie just process months 3,6,9, and 12)
But if any employees aren't directors that wouldn't work, because of NI thresholds.