Yea, I think a lot of commands should get their counter parts, like /refresh has /rf or /reset has /rt. Good Idea

decapprize is not shortened to avoid missclicks and things like "reactiontime" couldn't be shortened, you should show what the commands shortened would look like.

overall it's a good suggestion that i agree with.

for the decapprize command, type /dec then just press tab

This, yeah.
Autocomplete feature has been for a while in the game, can be useful when you're lazy to type the full command.