Welcome to the forums,
I know the subfolder of sent issue has been brought up a bunch - actually the RFE is here:
Bug 11729 - Subfolders in Sent show "From" column instead of "to"
There will eventually be options to turn on and off individual columns.
It is most likely that these requests/issues have already been put into
bugzilla.
Many are possibly planned for the 5.0 release, if not, be sure to add your vote to the RFEs/Bugs.
See
PMweb for planned release information.
(you can also
search the forums for comments)