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Even the Open-source Spring RTS project has this. And it was made from parts of Total Annihilation RTS game.  :P

 Well there is another option on rail walking! It would become as a kinda mini-game where there is a bar that slowly goes to the left or to the right noting the balance of the spy! The player could influence this bar with pressing left and right keys(The closer to the center the faster the spy would walk).
If the spy starts to fall down from the rail there should be a way for the spy to grab and hold onto the rail(most likely with button press), but grabbing onto the rail would make some noize so the mercenaries would know something ain't right! Though the spies are most likely great athletes and acrobats I don't think that they could then pull up the rail and continue walking(All though it might be possible! otherwise the spies could just lean on the rail sideways while hanging from it!)