Ive seen a few servers have it but i reckon along side the Reaction plugin; adding in the unjumble plugin can be challenging and fun because you have to see if its an unjumble or reaction. Some players may reaction the unjumble characters.

 

So say it comes up as reaction and the word is hGFT2H7hs; therefore you type that in however; if it came up as ReCePEr then you unjumble it instead and write creeper or something