Repeat Last Action Right-clicking in an empty spot in the flowchart view of the window brings up a small box of options including Repeat Last Action. This can save a lot of time when doing repetitive editing;
Duplicate Selected Items Selecting items in the flowchart view and using Ctrl + D or Insert duplicates the selection and offsets it a little. You can then drag it elsewhere and edit it.
Extended Tool Section Double clicking the Connect tool will select this tool indefinitely. This allows module connections to be completed sequentially which can save a lot of time when multiple connections need to be completed.