One-click Guild Bank Repair toggling.

After setting the eligible guild ranks and the gold limit in the options menu, you are set. No more fiddling with multiple Guild Control Menus everytime you want to toggle guild repairs.

How-To:

After installing, a small window will be shown at the top-left of your screen. Hold shift and leftclick into it, to drag it around.

To enter options, rightclick the window.
On the left will be a list of guild ranks. With a leftclick you can activate the guild ranks which you want to allow guild repairs for.
Also enter a gold limit (it's the same for all ranks) on the right.

After a click on OK you can toggle guild bank repairs on and off for all selected guild ranks by leftclicking into the main window.

Disclaimer:

This addon changes guild member permissions. If you don't trust a 3rd party addon to handle this, do not install.

I tested this addon to the best of my knowledge, but bugs or technical changes in future patches might put your guild security at risk.

Just like with the standard Blizzard UI, you require status of Guild Master to actually change any permissions, this addon will not "hack" into Guild Control for you. :)

Also note, while this addon will only change repair permissions, the gold limit is shared between fund withdrawals and repairs (just like in the default UI). Be aware of this when changing the gold limit and disable the funds withdrawal permissions manually if needed.