I usually do connector layout so that you can safely short any two adjacent pins together (whenever possible).
Excellent safety idea. I guess it depends on your audience. For end users, idiot proof and safety over flexibility. For test/design users, flexibility and ease of modification, but safety not too far behind. I am reminded of the old TV "cheater" cords.
Since I was designing for myself and one-time use (hopefully), I scrounged instead of ordered. This should have been a quick, trivial affair (sigh).
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