Copy in Place (by Winstom Mitchell)
If you make a selection and then click this tool, you can move or do whatever you want to do to the selection, leaving behind an unaltered copy. This reduces the steps required to make a copy of a selection in situ, something I find myself frequently doing.
Select Near Cursor
This pair of tools helps you to select graphics in complex drawings, where this task is not always easy. It similar to the standard F6/F7 keys for cycling through graphics, but it only selects graphics nearby the cursor.