Deepak,

No, we are not suggesting you have stepped out of line at all, or that you should do anything other than what you have done. My post was mor along the lines of a rationale for the approach you have taken, and some backup arguments.

What we are suggesting is that you implement the suggested solution, and run with it for now.

Meanwhile, you have applied for dispensation, and as and when IT respond. If they respond negatively, you can go back to them and tell them how it has allowed you to not have to sit in front of the monitor making sure it didn't autolock, and explain how it allows you to be more productive at no real risk to security, and ask if that changes matters. If they still say no, then I think that you have no choice but to remove it, otherwise that would constitute deliberate flouting of the decision