You could just have a command like this:
<command name="LookAround">
<pattern>look around</pattern>
<script>
room = game.pov.parent
if (HasString(room, "lookaround")) {
msg(room.lookaround)
} else if (HasScript(room, "lookaround")) {
do (room, "lookaround")
} else {
ShowRoomDescription()
}
</script>
</command>
If the current room has a string attribute called "lookaround", then it prints that string. Else if the current room has a script attribute called "lookaround", then it runs the script. Else, it just dumps out the room description (as if you'd done "look").
You might tick people off, though, if "look around" is significantly different from "look" (which might be considered the same thing by many).