Flag to not write a tab in the Excel Writer

Hi, I mailed a big example of a workflow showing the slow Excel writer performance to Jürg Wasserman (see the other post KNIME 4.5.2 Excel Reader extremely Slow when reading from other sheet different than the first - #8 by JoergWas). Can you align with him? The Workflow shows how I dynamically handle the regrouping of potential empty tabs.
Is this ok for the moment or do you need more from my side?