SableWyvern
Hero
You certainly can, if you'd like to.Maybe we can have Command replicate other 3rd level spells? "Ignite" can make the foe light himself on fire? "Dispel" can make an enemy caster end his spell early? "Slow" can make them move at half-speed and take only an action OR a bonus action? "Rest" or "Heal" can make the target use a HD? The options are endless when Command is a first level Power Word spell.

For myself, I'd only allow ignite if the target has some inherent means of self immolation