dear list,
1. if use \\, there will show a '\' in bookmark, how to ignore it.
2. if use \midaligned, the next pargraph's indentation will not work properly. there is no problem with using \startalignment[middle].

ex:
\setupinteraction[state=start]
\placebookmarks[chapter]
\setupinteractionscreen[option=bookmark]
\setupindenting[yes, big, first]
\setupheads[indentnext=yes]
\starttext
\chapter{Long\\ title}
\midaligned{knuth}
\input knuth
\stoptext

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ConTeXt ver: 2013.01.02 18:19 MKIV fmt: 2013.1.3

Thank you.

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Best regards,
Lukas