I haven't read any posts, so forgive me if i repeat something but here are some things i'd like to have added:
Session/Hand Reviewer:
Where you can add comments on every street in the HH-file.
Patternfilter:
A filter where you can filter betting patterns.
e.g.:
PF 3bet, Flop raise, Turn check, River check raise
or even more accurate w/ bet amounts like min-raise or 3/4 pot.
Sklanskybucks