Why is it not possible to set ctrl + tab as keyboard shortcut on mac os x and Textmate?

I switched to Textmate and want to switch tabs with Command + Tab (like in NetBeans).

The menu command is Navigation - Next File Tab. But it's not possible to set any shortcut with the Tab key? Is this a general limitation?

Solution

The Tab key is sacred in textmate :-)

It's the trigger for the snippet engine so ... Cmd + Opt + arrow keys will toggle through the tabs. Also, Cmd + (1 till 9) will jump to a tab.

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