for this very scenario we added the Clear View Rules option to the views (can be found in the view popup menu or under Edit | Clear | Clear View Rules). When you have a filtered view and want to quickly see the entire context for a particular log entry, then you can just select this log entry and call Clear View Rules. The view filters etc. are then removed from the view and all log entries are shown.
The mentioned global bookmarks functionality is interesting nonetheless. But it might also be a bit confusing since each view can also have its own set of bookmarks. A better idea would probably be a simple Synchronize option which automatically scrolls to a synchronized log entry when switching views. What do you think?