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In prior versions: if Auto Input was enabled, the default behavior was to monitor the Input of all tracks when stopped; even if they aren't armed. Tape Machine Mode changed the behavior of Auto Input so that it doesn't always monitor the track inputs when transport is stopped. After some discussion on IRC, we determined that Tape mode is likely more practical for a DAW user, and therefore a better default. Rather than default an ambiguously-named preference "on", we decided to invert the behavior, rename it sensibly(?), and default it OFF.
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html