Add CAD path creation/modification tools
Some wonderful tools that would help are Trim, Extend, and Corner tools.
Trim allows you to stop a line at another line. So if you drew a + you could trim the top to the - and make a T.
Extend does the opposite. It makes a line longer until it hits a target line. It turns |- into a T (rotated).
Corner tool trims or extends two lines as need to make a corner. |- becomes L by clicking both lines.
Look to AutoCad or Revit for examples.
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