So... big fan of gts!
Anyway...
Speed scales if you reload the game. Say you go from 1 to 5 with player.setscale or setscale while targeting something, like a housecarl, follower, and or anyone they get bigger. You save and then load your game they are as fast and as strong as the size they are. A mod that would make the ground shake would be great! Giants make the ground shake too... Just a thought.
Get modding!