Question [Q] Android L Preview Keyboard

Wanted to know if anyone knows if it's possible to install the new Android L Preview Keyboard on the Note Pro?
I am rooted and found a toturial to install it on "any android" device but still affraid to do that.
The SGNP keyboard has many keys like the Arrows keys and the Tab key and the Ctrl key that I believe won't be found in other keyboards, is that right? What do you think about that keyboard? Do you recommend installing it?
I know there is a an app on the Store but is it safer to install the Zip file for the rooted devices? what's the diffrence?