Don't know the status of the Bundle Editor, but I had the same issue with menu items in my own tmBundles and whipped up a quick (drumroll...) tmBundle to help me with that. Not a full Bundle Editor, but available right away.
Now that TextMate is at version 2.0 could I ask what the status of the Bundle editor is ? A lot of functionality that was available in v1.x is missing — for example:
This is a fair question but I’m sorry to disappoint here, as I decided to forego a proper bundle editor for 2.0, as I simply couldn’t find the motivation to work on this.
Creating specialized UI is time consuming and generally not very re-usable, therefore I wanted to have a proper design for how to structure a new bundle editor rather than patch up the existing editor (adding drag’n’drop etc.), but I still haven’t come up with how I want to structure things.
Right now I am working on the main text editing component, while not being in as bad a state as the bundle editor, I think this work will have a much wider impact, so that’s where my resources are currently spent, but the bundle editor is without a doubt one of the components I feel need the most attention, so I do hope to find the time to address it.