i know this will most likely not be added, but sound is a physics property. it could act like ''laser'' in powder game, only going in 8 directions, and have a simple arc shape. you can change concentration with the f1 f2 f3 etc. when frequency is high, it can break glass. if landed on a solid element (metal or such) it would create vibration through that element. f.ex, if soundwaves hit goo, it breaks the goo. sound also increases pressure in the surroundings.
again... I KNOW THIS WILL MOST LIKELY NOT BE ADDED, BUT ATLEAST CONCIDER IT.
it could go in the scale of ''high frequency, low wavelength, or low frequency long wavelength.
@DarkShadowz i agree sound would be good... ...I especially agree with the new catagory, not called "electromagnetic spectrum"(sound has nothing to do with EMS) but just "waves", this would be were nuetrons and photons would go, along with the wavelengths you suggested.. but i guess this was rejected too, oh well.
As peoples always say, this isn't realistic toy, and we already have 'radioactivity', and it would probably be harsh to put enough propreties to the waves so that we could explore them and almost impossible to make them enough realistic to be valable, and I don't see many uses....