Well that script certainly looks interesting, but to me not that practical, case and point, for the first functionality, the only scenario that i can think of that i needed to do that was while recreating the topo of a hi poly in which case Max's 'Extend' tool (Graphite Modeling>Freeform) does more or less the same thing…
well, this tool is extremely useful for complex hipoly (organic) geometry like baroque/historic objects. It is indeed also very usefull for retopoing. Sadly the "quad from edge" is the one I am wanting the most. Btw thanks for the script Bryan, any chance you could make something like "quad from edge" ?