Comment 2 for bug 319652

This has been resolved upstream now, although the implementation is slightly different to what you asked for.

From Damien Sandras:

"Double-clicking and having nothing happening is annoying.

I have just changed the behavior so that it enables/disable the account.

I think that you do not edit accounts very often, however, you probably
enable/disable them more often, so I think the behavior I just implemented is
better."