"Exploit the map"?
If anything your just copying an effect of automap in a smaller box, more organized box, how is that giving a advantage? The feature is still usable even when "this feature" is cut off, sure it may not look good, but doesnt really effect gameplay much. Im all for oldschool stuff, but its game design 101, Player must be in control of much stuff as drawn possiable, it makes the player happy, and the game more interesting. No, im not suggesting any removel of what we already have server-side switched. But this feature really doesnt seem enough imo, to be added as a server-side switch. Please take those in to count when coding.
Good luck.