1)
Choose what shortcuts are displayed on the toolbars, and the order of the shortcuts.
2)
Define more toolbars, custom by user.
3)
Assign custom icons (or bitmaps) to the shortcuts, maybe even a sort of iconpack (thus semi themed).
4)
Per shortcut set to show text as well as icon (next, prev, root etc.)
5)
Have shortcuts to the bookmarks on the toolbar.
6)
Seperate tree views for the panes (option).
Most suggestions (all but 1) are for the toolbar and just come to one thing mainly, the ability to customize the toolbar to the user's preference.
Hope some of the suggestions will make it to a later version.
Future feature suggestions - Some minor suggestions only.
Moderators: fgagnon, nikos, Site Mods