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It would be great if we could have some more control over line wrapping in Konsole. Namely:

1. The ability to turn on and off line wrapping completely, so that when turned off long lines produce horizontal scrollbars instead. e.g. implemented with a menu check-item for "Line Wrapping".
2. The ability to turn on and off the ability to dynamically rewrap existing output contained in the scrollback buffer. e.g. implemented with a menu check-item for "Dynamically rewrap scrollback".

If #1 and #2 are both enabled then the width of historical scrollback output dynamically adjusts to correspond to the width of the Konsole window. If #1 is disabled and #2 is then toggled from off to on, then all wrapped lines in the scrollback buffer will now flow beyond the width of the Konsole window and horizontal scroll bars will appear if necessary.

I believe the functionality of #2 is already present in the Terminal.app in OSX (though not sure if it's configurable), and both would be a great time-saver as would mean that re-running unreadable line-wrapped scripts would no longer be necessary.

There is also a request for #2 in the Ubuntu brainstorm, and it also looks like the GNOME guys are already trying to implement this in vte:
http://brainstorm.ubuntu.com/idea/26528/
https://bugzilla.gnome.org/show_bug.cgi?id=336238

Come on, we can't let an inferior DE like GNOME get the better of KDE !

Yes, and I think one should be able to choose which symbol to put in front of a wrapped line (eg in Kate, when wrapping there is an arrow instead of the line's number).

Just discovered these both on Bugzilla after tweaking my search (though not discussed how could be implemented together), so vote there too:
#1: https://bugs.kde.org/show_bug.cgi?id=62380
#2: https://bugs.kde.org/show_bug.cgi?id=196998