If your going to grease the cable I would only use wet silicone spray. That way things don't get "gunked up". But you can also grease the throttle spring and such with just about anything. If your throttle body was "sticking" you would feel it in the gas pedal as the are linked together with the cable. It would be a knotchy feeling, That would not have a smooth engagement of the accelerator pedal, and your car would 'lurch' forward when trying to make it cruise faster.
I'm sure if you fiddle with your throttle cable enough at the throttle body, you can figure out how to dis-attach it.
Have fun- don't think its going to fix your issues that your having. good luck tho.