I think maybe you misunderstood the stack suggestion.
In "layout"->"slots"->"stack slot", being able to put in more than one slot for stacking tables. There could for example be a option of "how many stacks", and then which slots for the stacks. For example: 2 stacks, stack 1 in slot 1, and stack 2 in slot 2.
Whenever a new table pops up in the "new tables slot", you could then use a hotkey "send to stack 1", or "send to stack 2", instead of just "stack table", and everything going in the same stack.
In "layout"->"slots"->"stack slot", being able to put in more than one slot for stacking tables. There could for example be a option of "how many stacks", and then which slots for the stacks. For example: 2 stacks, stack 1 in slot 1, and stack 2 in slot 2.
Whenever a new table pops up in the "new tables slot", you could then use a hotkey "send to stack 1", or "send to stack 2", instead of just "stack table", and everything going in the same stack.