I can't really see the appeal of this, and I can't see it ever being implemented.
Some of the central tenets of DROD puzzles are - no randomness and the availability of all information required to solve the puzzle.
Let us suppose that you have 50/50 chance of activating a token - what's to stop you restoring back one (or more) moves and stepping on it again until you activate it.
In general, I don't see why players should be randomly penalised, at no fault of their own.
If you really want a situation where you have to solve a mini-puzzle elsewhere to access a token, why not have a yellow door barring the token, with the mini-puzzle leading up to an orb to open that door.
[Edit: Post-collision. Yeah, what he said]
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[Last edited by Jacob at 11-20-2008 12:23 AM]