Think of Adapting the Range of your Wireless Network

To improve the safety and security of my wireless network at home, I performed some tests and modified the emitting power of my Airport Extreme (802.11n) station. I am using a MacBook Pro and I almost always use the wireless network in my office or my living room.
I went down to 10 % of the max emitting power of the station without affecting the quality of my wireless network; it does not seem to affect data transfer speed even for the wireless Time Machine.
I think it is worse adapting its wireless network for at least 2 reasons:
- Reducing the "bubble" of waves, despite claims from manufacturers it is better for our safety.
- Avoid your neighborhoods to be tempted to crack your wireless network to use.
I am sure that my wireless network is not stable/usable outside the defined area I selected. Of course, one can not directly act against the waves from your neighbors wireless network, however you could explain them why it would be interesting for them to apply such strategy.