ihaveapc

-open terminal
-type defaults write .GlobalPreferences com.apple.mouse.scaling -1
-reboot
Congratulations you have 1-1 mouse movement

Native dpi is the dpi the sensor can output without the help of an mcu thus eliminating most of the other interpolated dpi's latency. Interpolated dpi steps are also not true dpi outputs,they are emulated. In almost every case it will give the highest malfunction speed.
An example is the g400 which sports the avago 3090 sensor.
This sensor has a native dpi of 800 and 3600,the rest are interpolated.
At 800 dpi the g400 has the highest malfunction speed and the best responsiveness.
Thankfully the latest sensors such as the 3310 and 3366 have a lot of native dpi steps ( the 3310 has native dpi's in increments of 50 and the 3366 is advertised having all of it's dpi steps native)

Do you really need a wireless mouse?
Fps games demand responsiveness and wireless mice can't compete with wired ones in this regard.

It shouldn't be an option for a serious gamer.

When you play fps games, if you need to make a sudden turn you will do so by moving the mouse very fast.
Mouse sensors have a certain max speed before their tracking malfunctions. The behavior above the speed is different from sensor to sensor ,some stop others throw the cursor around and don't follow your swipe.If ,while moving the mouse, you cross that "malfunction speed" your aim will go haywire thus preventing you from making fast,consistent turns or moving the cursor quickly to use a spell in rpg's. This is more concerning if you have a low sensitivity.
This is what differentiates cheap sensors from high end ones the most.
That is what the enotus mouse tester program shows at m/s velocity.
Sensor acceleration nowadays is high thus it shouldn't concern you.
When buying a mouse, you should consider it as it is quickly becoming the benchmark of sensor performance.
Hope i covered all your inquiries