Considering last version of my addon:
NumLock key remapping works good only for ‘slow’ actions. Do not macro potions or important spells on it. NumLock works with a delay, so if, for example, you have [Fire-till-kill + auto-retalliation], monster comes in melee and you would try to drink a potion – it wouldn’t work (died twice before understood source of problem). So it’s only safe to use NumLock for misc. actions which you wouldn’t use in battle (like show ‘map’ key)