Version: (using KDE 4.1.0) Installed from: Fedora RPMs Mouseover tooltips aren't shown at all in konqueror when the option is checked _unless_ you check the same option in Dolphin. Took a long time to figure out when I use konqueror for everything.
I can confirm the bug in 4.1.1 and trunk rev. 864904.
Here using: Qt: 4.4.3 KDE: 4.1.86 (KDE 4.1.86 (KDE 4.2 >= 20081221)) kdelibs svn rev. 901624 / kdebase svn rev. 901624 on ArchLinux x86_64 - Kernel 2.6.27.10 The tooltips are shown in Konqueror if you set it in its Configuration dialog (no matter if the setting is checked in Dolphin). However, after closing and restarting Konqueror, the setting isn't mantained. (It's disabled again, and tooltips doesn't show)
This is still the case in 4.2.0 Just in case it's not clear, what happens is that Konqueror loads the Dolphin setting for this option on startup. It can be changed per session, but to make the option persist it must be set in Dolphin.
This will be fixed in KDE 4.2.2, to be released next week: All file-management related settings are now saved immediately when a change is made, no matter if it's done in Dolphin or Konqueror. *** This bug has been marked as a duplicate of bug 175085 ***