However there is one thing that I can't do so I wrote this now, maybe some of the RE wizards jumps in and wrote what I want

So there a short description about what I need:
First some ingredients:
two keys involved : (" [ " and " ] ")
6 floatspeed variables : 10 , 50, 200, 500, 1000, 2500
So everytime when I press a one key ('[') it use lower speed variable (from preconfigured speed variables as seen above), and second key (']') scrool througth that list in reversed fashion

Can its possible to do ?
