In BE Prefs/BiBTeX I have all 3 tick-boxes set in the right column. I presume it is the second one that does escaping. Oddly, despite that, in both the formatted preview and the Format manager for Bibtex, no encoding of diacriticals occurs. I see:
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address = {Montréal, Québec, Canada Republic and Canton of Geneva, Switzerland},
Inline use of ampersand, percent and dollar signs are also not encoded (for the abstract examples I've pruned some text):
unescaped %
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abstract = {Over 85% of the user’s interaction is direct—a single point-and-click designates both object and operation.},
unescaped $
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abstract = {Instead the promise of exponential growth in computing/$/volume demanded that ...},
unescaped &
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volume = {Proceedings of the 18th ACM Conference on Computer Supported Cooperative Work & Social Computing},
Aha, the problem is the Bibliography dialog which allows you to set the BibTex filter but invalid formats. I'd left the output format as 'UTF8', assuming this would give me a UTF-8 text file in BibTeX format. It does,
sort of , in terms of adding the main { } around the output field data but not doing the LaTeX style escaping. IOW, to the casual glance it *looks* like BIBTeX but isn't really. If The export filter is BiBTex, I'd suggest that BiBTeX be auto-selected as the format choice. Why would one want to export incompletely encoded BiBTeX. The manual, p.325 doesn't really explain this.
I can confirm that with the Biblio export set to use the BiBTeX filter and export to disk and with the 'BibTeX Markup' format selected I do get a clean export.
So, the hard-to guess villain of the piece here was the Biblio export allowing me to select an incompatible export format choice.
FWIW, 'BibTeX Markup' outputs a UTF-8 [sic] text file with a '.bib' extension.