Yikes, sdpilot!
sdpilot, since you said
"grab the sidestick", I assume you fly an Airbus.
If you are willing to ops check the structural integrity of an Airbus, my hat is off to you. Also my tail, my engines, and anything else hanging out in the wind.
On a serious note about maneuvering to stop hijackers, I would consider it only as an absolute last resort, eg the hijacker is in the cockpit with his arms around the throat of the other pilot. As many people have mentioned the pax are going to be a huge resource now, and if someone is attacking the door, your maneuvering may hurt the good-Samaritan pax and end up helping the hijackers. Or Bruce the F/A may just be winding up to brain a hijacker with a bottle of Chardonnay when you lay on the G's. Unless you know FOR SURE that maneuvering will help the situation, it's not worth it.
Better to have the strongest (usually the most junior, right?) person waiting by the door with the crash axe, flashlight, bad breath, and lots of adrenaline. Soon, though, you will have the awesome equalizing power of a gun at your disposal.
Use the maneuvering if you have to, but I would not use it lightly.