custom pads are best designed with freecad to be honest. Use stepup to get them into kicad.
Thank you all for contributing to this question. I feel I always need to have a calculator or spreadsheet handy when making a footprint. I would rather do that than wonder what the software will do in response to something other than a simple number. But if you ever hand assemble boards I do think you should try a footprint with the fat corner pads, especially if doing fine pitch such as LFCSP or MSOP-10. I did my first electronics assembly in 1965 and my hands were never so steady…the fat corner pads are a significant help. Regarding the trace snapping to the nominal pad location…that makes sense. I like to use traces as fat as possible so it might actually work better for me to reposition the pad rather than the offset. But I think the offset is a nice capability.
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