Giving each player their own view with dynamic lighting, but not allowing them to move their token

I'm gearing up to run a play by mail battle royale, set in a labyrinth. I want to use dynamic lighting so each player can only see what their character can see (what room they are in, with fog of war of what they have seen in the past). That aspect is easy enough -- but I also don't want to give players control of their tokens so they can't move around and scout on their own (ie: cheat). Is there a way to get the benefits of dynamic lighting for each individual character, but keep them locked in where they are? I've thought about just dropping blocks so at most they can move around in the room they're in as a backup, but I'm hoping to have an easier solution than that. 

Hi Matt! You can manually lock tokens in place on a right click, though to do it automatically would require a Mod script, which is a Pro perk. You can also set your page to update sight on token drop. That way, they have to actually finish their move and  thus   reveal their movement to all, Then there's always the Final Option: don't play with cheaters.

Right click on the token, select the "lock position" option. Unlock to move then relock.  There may be an Mod (API Script) that can automate the locking process to make it so only the GM can move it. But that is a Pro feature. edit: ninja'd by Keith. :D 

I didn't notice the lock position button, that's exactly what I'm looking for! Thanks everyone! And yeah, I don't play with cheaters, but everyone gets curious sometimes!