Problem description: 
LibreOffice has a Repeat Find keyboard shortcut. It doesn't have a Find Previous shortcut.  And "Repeat Find" is non-standard and inconsistent even within LO; note the tooltips for the buttons in the Find toolbar are "Find Next" and "Find Previous".

Steps to reproduce:
1. Press Ctrl+F in LO Calc or Writer to bring up Find toolbar.
2. Note the up arrow icon with a Find Previous tooltip.
3. Choose Tools > Customize... > Keyboard.
4. Search for a Find Previous function to assign a keyboard shortcut.

Current behavior:
I couldn't find one. There is the function Edit > Repeat Find assigned to Ctrl+Shift+F, but that has no direction.  It implicitly repeats the search in the last direction chosen, so you can't switch direction from the keyboard.

Expected behavior:
I think it would be better if LO worked more like other applications and had Find Next / Find Previous commands matching the toolbar. (Maybe having separate commands would permit LO to have Find Next / Find Previous items in its Edit menu, like KDE programs and Firefox; I guess that's another bug...)

Also see bug 47119 and bug 47120 I filed about other non-standard Repeat Find details.

Platform (if different from the browser): Kubuntu 12.04 alpha 2 amd64 with regular updates
              
Browser: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120216 Firefox/11.0 SeaMonkey/2.8