

Got it. Thanks to this thread
More Hyphenation After 1.2 Update?
In epub renderer (RMSDK), the hyphenation is controlled through
adobe-hyphenate property. So, if you add/modify the CSS inside the ebook with:
Code:
body { adobe-hyphenate: none; }
hyphenation is killed.
Nevertheless, the "bug" with
white-span: nowrap is still active. I sadly made a bad guess... (I'll continue investigating but in the Bug Thread).
I want to thank every one of you (davidfor, Peakcrew and robko) for the hints you've given me.
PD.
hyphens,
-webkit-hyphens, or even
-adobe-hyphenate or other similar properties DON'T seem to work in RMSDK. The correct one is just
adobe-hyphenate.
PDD. The full options for
adobe-hyphenate seem to be: none | explicit | auto (see
this post) but the author doesn't explicit what each of them does. I suppose explicit only breaks words on shy;* but I haven't tested.