keyboardmacos
I've tried Ukulele and KeyRemap4MacBook. Neither does what I need to do.
I want to map the top-row 4 key and the top-row 8 key to SHIFT. So that, for example, when I press 4 + g it types a capital G.
Hitting the shift key with my pinkie is aggravating my carpal tunnel. On my windows machine I just remapped 4 and 8 to shift and I use a keypad if I need numbers. Savior for my hands.
This is more or less exactly what I wanted.
http://kevingessner.com/software/functionflip/
Works perfectly and no BTT is needed for setting the keyboard shortcut (Do it through Keyboard -> Keyboard Shortcuts in System Prefs)
Just changing caps lock to key code 63 with PCKeyboardHack works for me. Have you tried setting caps lock no action from System Preferences?
You could also try to use PCKeyboardHack to for example change caps lock to F19 and then use a private.xml like this with KeyRemap4MacBook:
<?xml version="1.0"?>
<root>
<item>
<name>test</name>
<identifier>test</identifier>
<autogen>__KeyToKey__ KeyCode::F19, KeyCode::FN</autogen>
</item>
</root>
Best Answer
Ukelele should be able to kind of do this by making 4 a "deadkey" that generates the uppercase letter for any key typed after it, unless there is a limit on the number of keys you can have in such a sequence. (Just like alt + e is a deadkey that generates acute accented versions of any vowel typed after it)
Of course this is not exactly like Shift, because you can't hold it down, you have let 4 go before you hit the next letter.