No side effects, the two files are nothing more than xml files that define the power button menu.

Don't edit them unless you understand how the structure of the xml files work. But you should be able to change the icons or remove them if you don't want them. I included the original files in the zip incase your fiddling goes wrong. Experiment and have fun with them.

I also installed "Cellular Modem Control Buttons" this added the Tablet mode button to the power menu.