1) \showinstalledlanguages does not show pe/persian/fa or anything like that but it has several arabic variants. was this dropped in MkIV or was there never a persian language environment even in MkII? I thought there were translated labels for Farsi somewhere.
2) In the following MWE, ad-hoc hyphenation using \- works and leads to hyphenation. However, specifying the pattern at the beginning does not have any effect. Am I missing something?
\usemodule[simplefonts]
\setmainfont[dejavusans][features=arabic,range=arabic]
\setupalign[r2l]
\showframe
\
hyphenation{سازمان-دهی}
\starttext
%% The above pattern is not used here and the long word moves into the margin.
\dorecurse{14}{سلام }
سازماندهی
مناسب.
%% It does work here, though.
\dorecurse{14}{سلام }
سازمان\-دهی
مناسب.