Need GM Clarification on Player Casinos/Lotteries

[Mauuk]

Something came up in an ingame discussion recently, actually, that I'd like some GM input on if possible. When making a roll with the /random command, it doesn't seem that the range of the roll appears in the chat window. Is there any way for a player to independently verify that another player is making the full roll they claim to be? I'm worried that it would be too easy for someone to roll a narrower range than they claim to in order to stack the odds.

For instance: The imaginary Lottery Jack says that any number from 600-1000 is a win, with rolls of 950 or higher scoring triple. To keep the odds firmly on his side, Lottery Jack often types /random 900 instead of /random 1000, eliminating the possibility of a triple win and greatly reducing the player's odds without their knowledge. Nothing I've observed when studying the /random command would allow a player to notice this was happening, and if Lottery Jack plays it subtle enough a GM may never be called to investigate and discover his cheating.

Have I overlooked something in the way the /random command displays that would prevent this kind of cheating? And if not, would it be possible to add a tooltip or something that displays the range of a roll?