[Q] Can I root but stay official? topic

I have a Sony Xperia Z Ultra, running 4.4.4. Is it possible to do a simple root (in order to make adjustments to the LED and sound), but not affect the stock ROM or over-the-air updates? I don't want to miss out on the official Sony Lollipop, so should I maybe wait to root until after that update is released? Thanks.