Keyboards generally don't need to be lubed unless you want it to be super smooth. But be warned, lubricating parts that are exposed to dust and grit can actually harm the part over time, reducing lifespan, while only providing a temporary reduction in friction. Any lube at any viscosity will hold onto dust and grit which can act like an abrasive that wears the parts internally. Hence why on automobiles any greased or lubricated components are either covered with a dust boot or filtered (engine oil).
On my Ducky Shine II the space bar was initially a little squeaky at first when I typed on it normally, but after a couple of days of use and a long essay it didn't squeak anymore. The solution? Everything and anything, when there is friction involved, will release small amounts of particles. With a metal stabilizer bar that squeaked against plastic fixtures, the friction would wear a tiny bit of the plastic in a dust like form that would provide dry lubrication similar to that of dry graphite lubricant. And now, voila. It is very smooth, very nice. Even some switches need to be broken in, mainly the linear switches if you are looking for the smooth feel. The springs well get slightly softer over time due to the repetitive stress and deformation they receive, but should still maintain most of their rate over time.
Bottom line? Don't lube it, unless it drives you nuts. If you do, go for a plastic-safe, silicone based lube that is synthetic. But be warned, keep a duster handy and make use of it or else it won't feel that good over time. Give it a chance, it's a great keyboard. Very jealous, but I love my backlighting. Happy New Year.
