I started using bind files when I made my first Warshade back on live and I fortunately I still had my bind files when I found HC.
Numpad1 drops Nova and/or Dwarf form and sets the primary tray to tray 1. Since the change for toggle suppression/recovery when shifting forms, I've also set Numpad1 to toggle on other powers with repeated presses (Athletic Run, Shadow Cloak, Maneuvers, Tactics).
Numpad2 toggles on Nova and goes to tray 3 where I have my Nova powers.
Numpad3 toggles on Dwarf and goes to tray4 where I have the Dwarf powers.
My 2nd tray has other powers and are bound to Numpad 4-0, Dark Extraction, Dwarf Antagonize, toggle for Orbiting Debt, Toggle for Inky Aspect, Eclipse, Quasar, etc.
3rd tray is for Incarnate powers and others that I specifically click.
Since first using the bind file, I've been using files for all my characters. Numpad1 with repeated presses toggles on athletic/ninja/beast run then sprint then replaces sprint with prestige power slide (slotted with a Celerity Stealth IO). Numpad2 toggles on or off the travel power, Numpad3 with repeated presses toggles on defensive powers. Numpad 4-0 are pet summoning, self buffs, taunts, debuffs, cone attacks, nukes, etc. Numpad0 is normally a self heal and NumpadEnter is normally a hold.
All this is to let muscle memory take over in most battles with my right hand on the numpad and left hand hitting attack keys (1-6 usually), movement keys, etc. I have an additional bind to set V to target the next specific target and SHIFT+V to 'beginchat /bind v target_custom_next enemy alive ' (note the space at the end) so I type the name of what I'm looking for and hit enter then V will attempt to target it.