"create tab stack" in context menu

[habmalnefrage]

Missing tab stacking (create a new one) via context menu just like in the original version of tab utilities:
Once you have selected all tabs, you right-click the selection and select the Stack Tabs option of the context menu. The tabs are then joined together, a NEW stack is created, and a number is displayed on the tab that indicates how many tabs are stacked in that group.

At the moment tab stacking only works with moving the tabs. And this is not very easy as it only works with very fast moving. If I don't move the tabs really fast then they wont't be stacked.
And often I do have a lot of tabs. That would be easier just to select them all and stack them via context menu then to move every single tab to the stack.

Or maybe it's just an adjustment in the (hidden) settings. I can't find it.
But the tab stack option appears in the context menu when a stack already exists. But for creating a new one it is missing.

Thank you in advance.
cheers