All the 20 over leagues I've played in over the last 6 years have had anything down legside given as a wide, you get two runs and no extra ball in the over. This is primarily to encourage offside bowling and also because by the time they generally get started, if you don't do this the matches end in the dark...
And let's face it, you are always being told to bowl at the off stump, so I'm not too fussed by it. If anything it's improved my bowling accuracy in Saturday games.