How do I disable the stock Gallery app?

I just downloaded QuickPic and so far it's all good and fast. It has more features than the stock Gallery including the ability to include / exclude certain folders from view. For this reason, I don't need/want the stock Gallery app to still be open-able. Is there a way to hide it from the list of applications from the grid of icons? I want QuickPic to catch all tasks that Gallery does and at the same time I want to prevent others (namely, friends who borrow my phone from time to time) from opening the Gallery app. Note: My phone (Xperia Active) is not rooted and I believe rooting it will void my 1 year warranty with Sony.