I know you can change (or add) a verb's script during play:

box.push => {
  msg ("This is what happens when you push the box now!")
  MoveObject (box, AnotherRoom)
}
box.generatedverbslist = Split("Push", ";")

//NOTE: This wouldn't work if 'push' wasn't set up as a command or verb (or if it wasn't a default command or verb).
//  I.e., if I were to try do this with 'box.flip', the parser wouldn't understand my command.
//   It knows not of 'flip'.

Is there a way to do this with commands?

SIDE-QUESTION:

Can you not write a script 'in-line'?

E.g., this doesn't work:

if (HasAttribute(box, "push")) {msg ("You push it. You push it real good.");MoveObject (box, AnotherRoom)}

Yes you can (I would assume) but why would you want to? It would be better to di if/else because in two months time you will be able to look at it and know what is happening.

Yes you can (I would assume) but why would you want to?

[Laughing maniacally.]

It's the shards, Pixie!

(They tell me to do CRAZY things sometimes.)

I could sort of pull off what I'm after with conditional statements, but if a command's script could actually be altered this way...

Well...

if (not KV.has_to_use_IF_THEN) {
  player.in_metaphorical_box = false
}
if (not player.in_metaphorical_box) {
  game.will_be_more_awesome = true
}