Yeah corner and comer is an edit distance of 2 but perhaps more lucrative than corner and corker, as a bad example.
I saw rnicrosoft in use the other day, somewhere.
Yes, Levenshtein in that case give too big an exploration space. A keyboard edit distance would probably work better. Delete and swap are still 1 but replace and add should be within say 1-key at most
It seems to me that "edit distance 1" still describes some very implausible typos.