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ChristianKl comments on Open thread, September 22-28, 2014 - Less Wrong Discussion
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http://www.ncbi.nlm.nih.gov/pubmed/18710605 seems to be published article in support of your claim. It's from a Chinese source so results can be interpreted with a grain of salt ;)
http://ajcn.nutrition.org/content/22/4/464.abstract is a Western source that also comes to the conlusion that potassium salt is good. Both sources recommend substitution with a miss of both salts. Given that nutrition is always about being in balance the idea of mixing seems good. That especially true as from what I can see potassium consumptions leads to increased sodium secretion so if you supplement potassium you might need more sodium than the average person.
However some people with renal failure to get problems through increased potassium consumption http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1124926/. Potassium also does seem to interfere with some blood pressure medications so someone who's on medication for high blood pressure shouldn't do this without speaking with his doctor.
I'm not 100% sure but I remember faintly that someone on LW got into problems by taking potassium as a nootropic.
I remember this too.
You're not thinking of gwern and magnesium?
Potassium didn't work out too well for me earlier either: http://www.gwern.net/Zeo#potassium
Kind of weird given how people generally seem to regard both potassium and magnesium as good to supplement. Someone mentioned that it might be important to keep the ratio of potassium:magnesium constant (so separate testing is not good) but I dunno how plausible that is.