[TxMt] key binding question

I recently switched to Mac from Windows.... I have specific keybindings that I want to use. Specifically, I want cmd-y to delete a line, cmd-d to duplicate a line, and shift tab to reverse indent selected lines.

In most apps I've been able to get cmd-y and cmd-d to work by adding this to the ~/Library/KeyBindings/DefaultKeyBinding.dict file

"@y" = ("selectLine:", "delete:"); "@d" = ("selectLine:", "copy:");

I don't know how to do the reverse indent.

These keystrokes work for most applications, but not for TextMate. I have also tried this file: ~/Library/Application Support/TextMate/DefaultKeyBinding.dict

Could someone point me in the right direction?

thanks phil