Mac – Remap arrow key to different shortcut

So, using a little plist trickery, I've managed to re-assign those keys.

The steps I took are the following:

• Aperture > Commands.. > Customize
• Duplicate current command set and name it "MySet"
• Export & delete the current set
• Open it with Property List Editor
• Find and Delete: MoveSelectionUp and MoveSelectionDown entries
• Save and exit
• Import it via Aperture > Commands.. > Import
• Select it via Aperture > Commands.. > Custom commands set

So now the UP & DOWN arrow keys are free to assign whatever you like (in my case Increase & Decrease rating feels like the way to go!)

To remap home and end in Terminal, run f=~/Library/Preferences/com.apple.terminal.plist; plutil -convert xml1 $f; open $f -e, and change this:

<key>F729</key>
<string>scrollToBeginningOfDocument:</string>
<key>F72B</key>
<string>scrollToEndOfDocument:</string>

To this:

<key>F729</key>
<string>&#x1b;OH</string>
<key>F72B</key>
<string>&#x1b;OF</string>

To change them in normal text views, create ~/Library/KeyBindings/ and save a property list like this as DefaultKeyBinding.dict:

{
    "\UF729" = moveToBeginningOfParagraph:;
    "\UF72B" = moveToEndOfParagraph:;
    "$\UF729" = moveToBeginningOfParagraphAndModifySelection:;
    "$\UF72B" = moveToEndOfParagraphAndModifySelection:;
}

Another option would be to use KeyRemap4MacBook. See the "Use PC Style Home/End (except in Virtual Machine,RDC)" setting in https://raw.github.com/tekezo/KeyRemap4MacBook/master/Tests/lib/string/data/checkbox.xml.