I need to type special characters (ä, ü, ö, ß) quite often.

Normally on MacOS applications this is done by press-and-hold a key and then select the special character. For applications where this gets in the way (e.g. MacVim) this can be disabled.

TextMate 2 seems to have this feature disabled by default. I can't figure out how to enable it. The command 'defaults write com.macromates.TextMate.preview ApplePressAndHoldEnabled -bool true' does not work.

Any tips?

I'm using TextMate 2.0-beta.6.3 on MacOS 10.10.1.

Best regards,

Markus