cmd_speeddecay

command: /speeddecay

quick ref:

/speeddecay [@playername] [surface_decay] [air_decay]

description:

speed decay when block is on ground or in air
@param surface_decay:  [0,1]. 0 means no speed lost, 1 will lost all speed.  default to 0.5
Examples:
/speeddecay @p 0.1