i can also only agree with the others. Since i've been working on a map with key movement since half a year (not steady working :> ) this is no big thing to me ^^ and i would say it's maybe helpful to others but as already said there are many other examples already done.. (e.g. azeroth grand prix by blizzard)
these are the hotkeys for the items. you could also just change the items to an ability, this is the easy way. ive noticed a lot of people asking how to do this. however, there are more complex ways to do this.