Samsung SCH-R530U aka the SGS3 for US Cellular is also missing this toggle although it is on the older Samsungs like the Axiom for US Cellular SCH r-830. I have yet to discover a way to make a setting shortcut to the s, l& i, T to S, driving. If anyone finds an app that will go this deep into settings or at least shortcut to Language and Input, please share. Thanks!
I found the above widget that works on the US Cellular SGS3 phone also. It does read out the time each time locked, it reads incoming texts, and phone call ids. However, it's on the phone speaker so volume must be turned up. The widget takes you directly to the settings etc spot to turn it on and off, so a little quicker to do than manually. This phone keeps the widget and there is no persistant green light on my phone (this type) at all. Hope this works for others. PS I couldn't find the paid version that affects bluetooth.