The new mod should be slender with multiple voltage options, also, the adapters should all match the product (meaning, that they look part of the mod).
Self customization option is pretty cool, with silicon skins which reduce the probability of completing circuit in pocket and will protect hands from burning if something happens and it gets hot. Also you can texturize the slip ons so that the mod won't leave your hands unless you put it down.
A way to block/lock the button (if there is one) so that there is no incidental turn ons.
Also, being able to switch from auto to manual is a great idea.
Self customization option is pretty cool, with silicon skins which reduce the probability of completing circuit in pocket and will protect hands from burning if something happens and it gets hot. Also you can texturize the slip ons so that the mod won't leave your hands unless you put it down.
A way to block/lock the button (if there is one) so that there is no incidental turn ons.
Also, being able to switch from auto to manual is a great idea.