This has been discussed before in this list, and Ripley said "no, no!". I do it all the time, but only in secrecy.
-- Jari Oksanen (about replacing zero distances with tiny values for isoMDS())
R-help (April 2006) #Rstats
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RFortunes (rfortunes)'s status on Monday, 10-Jun-2019 10:00:02 CEST RFortunes