Version:            (using KDE 4.2.2)
Installed from:    SuSE RPMs

The group view in Dolphin is very useful. However, I think it could profit from two additional features:

(1) Shortcuts for expanding / collapsing groups, at best down to certain folder levels, e.g. like this:

alt+0 --> collapse all groups
alt+1 --> expand groups to first sub-level
alt+2 --> expand groups to second sub-level
(etc.)

(2) An option under Settings to 'Collapse all other groups when expanding one group'. (The bookmarks sidebar of Firefox has a similar feature).