If you click on the "Extras" tab and scroll down to the bottom, you will see a section called "Exclude activities from menu", as shown in the image above.
By default, all textivate activities are available via the menu screen, provided the resource meets the requirements of each activity in terms of number of words etc. (And obviously, text activities are not displayed for match resources and vice versa...)
You can use this "Exclude activities from menu" section to exclude particular activities from the menu screen.
Simply select the activities that you wish to exclude, and those activities will not be available via the textivate menu screen.
Your list of excluded activities appears in the "Show all" tab, looking something like this:
3x5, 4x4, 3x6, 4x5, 4x6, hz6, hz8, h10, hza, par
Why exclude activities?