With the "Query Bulder" task, if one selects multiple datasets in a process flow then creates a Query Builder Task, then, not only is the Query Builder Task linked to all selected datasets, but the selected data sets are added to the list of tables of that task.
This is a very natural-feeling feature of the GUI. I'd like to see it used with other tasks that my use multiple datasets. The "Append Table" task is one of these tasks that could have this behaviour. I'm hoping this is a short, fast change that can be implemented easily.